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Title: 터널 / Tunnel
Chinese Title: 隧道
Genre: Detective, Crime, Thriller, Fantasy
Episodes: 16
Broadcast network: OCN
Broadcast period: 2017-March-25 to 2017-May-21
Air time: Saturday & Sunday 22:00


In 1986, Detective Park Kwang Ho (Choi Jin Hyuk) desperately tries to catch a serial killer. He chases after the serial killer and goes through a tunnel. On the other side of the tunnel, Detective Park Kwang Ho finds himself in the year 2017. The serial killer has resumed the killings that began 30 years ago. Detective Park Kwang-Ho works with Detective Kim Sun Jae (Yoon Hyun Min) and Professor of Criminal Psychology Shin Jae Yi (Lee Yoo Young) to catch the killer.


Main Cast

Choi Jin Hyuk as Park Kwang Ho
Lee Yoo Young as Shin Jae Yi
Yoon Hyun Min as Kim Sun Jae

Strong Team 1

Jo Hee Bong as Jeon Seong Sik
Kim Dong Young as Sung Shik (young)
Kim Byung Chul as Kwak Tae Hee
Kang Ki Young as Song Min Ah

Women Mass Murder Case at Hwayang in 1985–1986 (Ep 1–2)

Han Yeo Wool as Hwang Choon Hee (Rose cafe’s staff and the third victim in 1986)

Suicide at Hwayang Psychiatric Hospital (former Hwayang Chapel) in 2016 (Ep 2)

Park Myung Shin as Lee Sun Ok
– Shin Na Ae (신나애) as Sun Ok (young)

Kim Jung Hye’s Murder Case (ep 3)

Jo Shi Nae (조시내) as Kim Jung Hye/Kim Young Ja
Song Young Jae as Kim Tae Soo
Ryu Tae Ho as Jang Young Chul
Kim Choo Wol as hostess of Ho motel

Local House Robbery and Yoon Dong-woo’s Murder Case (Ep 4)

Choi Won Hong as Yoon Dong Woo
Choi Myung Bin as Yoon Soo Jung (Dong Woo’s younger sister)
Jun Jae Hyung as Noh Young Jin
Jung Soon Won (정순원) as Young Jin’s co-robber

Choi Hong Suk’s Murder Case (Ep 5)

Lee Dong Jin as Hwang Do Kyung (civil servant)
Jun Jin Gi as Kim In Hwan (teacher)
Im Do Gyoo as Ma Young Gil (baseball player)
Jin Yong Wook (진용욱) as Lee Dae Hwan (tow truck driver)
Woo Hyun as Go Man Suk (rest stop owner)

Impersonation and Jo Dong-ik’s Murder Case (Ep 6)

Seo Eun Ah as Kim Mi Soo
Jung Han Bi as Yoon Young Joo
Kim Min Kyung as Go Ah Ra’s mother
Yoo Jang Young (유장영) as Kim Mi Soo’s ex-boyfriend

Sun Hwa Dressmaking Shop’s Fire Case (Ep 8)

Ahn Yong Joon as Kim Hee Joon
Yoon Mi Hyang (윤미향) as Sun Hwa
Park So Jung (박소정) as Sook Jin


Lee Shi Ah as Shin Yeon Suk (Kwang Ho’s wife)
Kim Min Sang as Mok Jin Woo
Choi Seung Hoon as Mok Jin Woo (child)
– Noh Tae Yup (노태엽) as Mok Jin Woo (young)
Heo Sung Tae as Jung Ho Young
Ham Sung Min as Ho Young (young)
Lee Yong Nyeo as Yoo Ok Hee (Jung Ho Young’s mother)
Joo Ho as Reporter Oh / Oh Ji Hoon (taxi driver)
N as Park Kwang Ho (same name but different people with the cast play by Choi Jin Hyuk)
Moon Sook as Hong Hye Won (Dean of Hwa Yang University)
Kim Jung Hak as Kim Wan (Sun Jae’s father)
Yoo Ji Soo (유지수) as Lee Nan Young (Sun Jae’s step mother)
Seo Woo Jin as Jung Jae Hyung
Jo Seung Yun as as Hwayang police station’s department head
Yoon Jin Sol as Yoon Da Young’s friend


Jung Suk Yong as Kim Jong Doo (ep 1, forensic doctor of Hwayang public health center in 1986)
Oh Yoon Hong as Madam Jung (ep 1, owner of Rose cafe in front of the police station in 1986)
Nam Moon Chul as Chief Oh (ep 1)
Kwak In Joon as Hwayang police station chief in 1986 (ep 1)
Jung Yi Rang as Lee Geum Soon (ep 3)
Choi Il Hwa as Yoo Sung Jae (ep 8)
Park Jung Hak as Senior police officer (ep 9)
Song Jae Ryong as Kim Kyung Tae (ep 12)
Seo Yoon Ah as 88 Park Kwang Ho’s mother (ep 16)
Joey Albright
Jung Ji Hoon as child

Production Credits

Directors: Kim Kyung Chul (Replaced by Shin Yong Hwi starting from March/2017), Kim Sung Min
Screenwriter: Lee Eun Mi

Episode Ratings

Date Episode AGB TNmS
2017-03-25 1 2.760 2.9
2017-03-26 2 3.131 3.2
2017-04-01 3 4.228 4.1
2017-04-02 4 3.555 4.3
2017-04-08 5 3.522 3.6
2017-04-09 6 4.042 3.3
2017-04-15 7 3.863 4.1
2017-04-16 8 5.179 4.9
2017-04-22 9 4.700 4.3
2017-04-23 10 5.413 5.4
2017-04-29 11 4.921 4.4
2017-04-30 12 5.375 5.1
2017-05-13 13 5.491 4.9
2017-05-14 14 6.263 4.7
2017-05-20 15 5.843 5.4
2017-05-21 16 6.490 6.0

Sources: TNmS Media Korea & AGB Nielsen Korea (Nationwide)

*** Different between TNmS Media Korea & AGB Nielson – Here

*** Note: This drama is aired on Pay-TV channel which has fewer viewers than Free-TV channels. So, please don’t be surprised with the low rating. ***


Related Photo

(Other Photo from Official Site)

Official Site

Official Poster

Official Trailer
Trailer I
Trailer II
Trailer III
Trailer IV
Trailer V

Watch Online in Viki.com

Watch Online in Dramafever.com


  1. 1 : Heba Says:

    WElKCOME BACK Choi Jin Hyuk Oppa ♥♥♥

  2. 2 : tigerb Says:

    it stars cjh, why not?

  3. 3 : nada Says:


  4. 4 : Sky Says:

    Hmm what a strange plot. Normally it go to the past to save someone important….but this story is to go to the future. How do he know his daughter is in danger in future. I will watch the first ep cos I am curious about the plot.

  5. 5 : AnCe Says:

    so true, it is strange…i’m also curious how this drama will unfold…
    welcome back Choi Jin Hyuk!!!

  6. 6 : Hannah Says:

    I am excited for this drama! Watched the trailer and it seems promising.

  7. 7 : kathlyn Says:

    i think this drama is same in SIGNAL

  8. 8 : kathlyn Says:

    i think this drama is same in SIGNAL. BUT this drama Tunnel has no walkie talkie.

  9. 9 : Tunnel, o novo drama de ação e suspense da OCN Says:

    […] Fonte: Koreandrama.org […]

  10. 10 : exosaranghaja Says:

    It’s too bad that N can’t participate now in this drama. *sigh* Oh well. Gonna still look forward to this drama because of the plot ^^

  11. 11 : stick war Says:

    Hope this drama turns out nice and exciting.!!!

  12. 12 : shellsbells Says:

    This is pretty good so far I likes I likes

  13. 13 : Hannah Says:

    The 1st ep is a lil bit boring as it introduces the characters, but ep 2 is starting to build up the plot. Can’t wait to watch ep 3!

  14. 14 : Jyenie Says:

    This is my new favourite, interesting👍Especially EP2, it’s like turning to a new page😀

  15. 15 : Jyenie Says:

    Wow, just finished watching ep 3, so so good👍Really keeps me in suspense😅

  16. 16 : Hannah Says:

    I wonder who’s Kwang Ho’s daughter. Is it Jae Yi? Hmm

  17. 17 : leila Says:

    i’m enjoying this drama esp with choi jin hyuk in it! miss him so much glad that he’s got this role! oppa fighting! sarang hae yo! i wonder why the rating isn’t high, this is a good drama!

  18. 18 : OK OK OK Says:

    I am going to watch soon…… ha ha 😛

  19. 19 : Hannah Says:

    This drama is getting more interesting each episode! Can’t wait to watch ep 7

  20. 20 : Aki Says:

    Welcome Back Oppa!

  21. 21 : Susy indrayanti Says:

    Good acting.at first time.i did not like this drama.but from ep 2 it is geting interesting.

  22. 22 : CoolBeans Says:

    This starts out as a good detective drama with the look and feel of Gap Dong, where the strained small town police struggles to keep up with the very smart serial killer. It grows slowly to become a Great drama close to the level of Signal where a detective from the past helps the youngsters in the future. Jin Hyuk is more than eye candy in this one. His reactions when he sees new technology like smart phones are believable.

  23. 23 : Macchiato Says:

    Very exciting and engaging. Really looking forward to each new episode.

  24. 24 : Jam Says:

    huhu the plot. but he doesnt know that he had a child tho. this is a really good drama! RECOMMENDED! If you watched VOICE you will love this too !

  25. 25 : Hannah Says:

    I’m excited that I knew it all along that Jae Yi is Kwang Ho’s daughter. I kinda ship Jae Yi and Sun Jae together. I bet Kwang Ho’s gonna approve Sun Jae as his future son-in-law if he goes back to the past.

  26. 26 : ica Says:

    I like too, good drama, the story, excited me. Really interesting, I’m kind bored to something korean drama romance usually the story same as always.
    Bu this time like Signal, kind something plot story. Good drama. Recomend this one.

  27. 27 : OK OK OK Says:

    Tunnel is nice because i love crimes and mystery drama. 🙂
    Finished watching episodes 8…. looking forward

  28. 28 : ASJA Says:

    think i know who is real serial killer, it is the post mortem expert Mok Jin-Woo and not Jung Ho-Young episode 9 is awesome ;))))

  29. 29 : Mi Poong Says:

    Arrgh! The main guy gets annoying after a while.

  30. 30 : Mi Poong Says:

    So she finds his daughter.

  31. 31 : MaxT Says:

    This drama is almost as good as “Voice”. It’s getting more exciting to watch after episode 10.

  32. 32 : Chimsamchim Says:

    This drama is really good. Best Thriller-drama this 2017. The actors and actress are really good in acting. Also the flow of drama is really really good. You guys should watch this!😍😚

  33. 33 : Chungchung Says:

    Oh yes! I’m right the doctor is the another killer!!

  34. 34 : Hannah Says:

    Whoa this drama never fails to impress me! The cliffhanger ending of ep 12 leaves me speechless. I’ve always wanted Kwang Ho to be back to the past to reunite with his wife, but not this way! If I were Kwang Ho, I’d be frustrated for losing the killer for two times already at the same place!

  35. 35 : GJDG Says:


  36. 36 : Mi Poong Says:

    The drama went low IQ when the idiot cop discovers who the killer is and didn’t tell his teammates. Instead, he wasted a lot of time following his whim. Police protocol when followed increases the chance of a successful outcome. He ignored it and went after the killer armed only with his low IQ, a taxi ride and a cell phone turned that’s off but not before the killer phoned him. (facepalm). I suppose he’d use it to threaten the killer with. “Freeze or I’ll text you.”

  37. 37 : hana_goh Says:

    omg i like this drama more and more.. the next detective drama after voice that make me say “OH NO!!” in every eps..

  38. 38 : MARIA SUAREZ Says:

    Me encanta este drama, esperando los capítulos con ansias

  39. 39 : Korean Drama fan Says:

    Are you a big fans of korean drama? If yes, This application is the perfect for you.
    See the image and guess the korean drama and actor!

    【Guess Korean Drama】

  40. 40 : Oppa Says:

    What happen to ep 13 14…. Waiting to see the final ep.

  41. 41 : Susy indrayanti Says:

    Good drama….like it.

  42. 42 : lalang Says:

    luv luv this drama n choi jin hyuk rocks! this drama gets better each episode and you just can’t wait till the next one airs again! good plot n it’s just GOOD detective story full of good actors n suspense! HIGHLY recommend this!

  43. 43 : Poppykok Says:

    How can the cops not up their game and provide protection for Shin Jae Yi, given her abductor is out there? And for a criminologist trained in England; how can she be handling evidence on the crime scene without gloves? Simple things like that undermine the credibility of the drama.

    The killer got away from two cops backed by an armada of cop cars which conveniently didn’t think of blocking the rear of the house. Such incompetence is unheard of given the myriads of cop shows we’ve been exposed to over the past several decades. Standard police routines are ignored. Common sense is ignored.

    Still, I watch with a sense of being let down somewhat by unnecessary errors in the plot.

  44. 44 : sa_grant Says:

    Good drama!!

  45. 45 : sa_grant Says:

    Great drama, good casts!

  46. 46 : sa_grant Says:

    This one’s totally recommended!

  47. 47 : Tunnel – General Damselfly Says:

    […] KoreanDrama.org […]

  48. 48 : Hannah Says:

    This drama is nicely wrapped. I love the ending, it’s great that Kwang Ho could turn everything back to normal eventhough it’s a lil bit sad that the present people would not know the things happened as the past has changed.

  49. 49 : sanjinyeon Says:

    this is my first detective, crime,fantasy krama and it’s really worth watching coz the story and characters are good in their acting.

  50. 50 : heynie Says:


  51. 51 : tigerb Says:

    synopsis is wrong -kwang ho did not time travel to save his daughter. he just happened to meet his daughter at present time. just finished ep. 10. interesting series.

  52. 52 : tigerb Says:

    it’s a good watch. i thought at first that the sociopath killed those women because of his love/hatred for his mother, his mother left him and became the lady of the night, but the guy said he had the mission to kill those who deserved to die, thus i think that’s the reason he also killed those innocent old people.

    this is the first time i’ve watched a good casting of the young/old characters: yeon ho and moo jin woo, semblance of facial features.

  53. 53 : Pearl Says:

    I just finished watch this drama. It’s good to watch. This is for people who like a detective drama. I love the unique couple shin jae yi and kim sun jae. And as always, choi jin hyuk is soooooo charming. This is not a romantic drama, but I love it. Thanks the drama writer😊👍

  54. 54 : Tunnel Korean Drama Trailer 1 – Music And Movie Says:

    […] Tunnel […]

  55. 55 : Sabi Says:

    all i can say is recommended!

  56. 56 : Venezzz Says:

    Just finished watch this drama..this is a great drama, kinda boring with drama romance so i start to watch crime, law, detective drama..any sugestion of any good drama similiar like tunnel?please give me some recom (already watch signal, secret forest) thank u 😊

  57. 57 : Kay Says:

    This is a great crime thriller, and I liked the time travel aspects a lot. The actors are all great to go with the compelling story.

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