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On The Verge Of Insanity

Title: 미치지 않고서야 / On The Verge Of Insanity
Also known as: No One But a Madman
Genre: Office, Romance
Episodes: 16
Broadcast network: MBC
Broadcast period: 2021-June-23 to 2021-Aug-26
Air time: Wednesday & Thursday 21:20 (2 episodes back-to-back)


Choi Ban Suk (Jung Jae Young) is a veteran engineer, working as a developer in the consumer electronics division of Hanmyung Electronics. He has a calm disposition and a warm heart. He also has a sense of humor, but he faces the biggest crisis of his 22 year working career. To avoid being caught up in a wave of dismissals, he is transferred to the personnel department. He is completely unfamiliar with the personnel department. He decides to survive in the personnel department and not quit this job.

Meanwhile, Dang Ja Young (Moon So Ri) is the leader of the personnel department. She was promoted to the position recently. She is a workaholic and she wants to become the company’s first female executive. Choi Ban Sukk is a new member of the personnel department. She doesn’t know what to do with him, but her life slowly changes by working with him.


Main Cast

Jung Jae Young as Choi Ban Suk (HR team member)
Moon So Ri as Dang Ja Young (head of HR team)
Lee Sang Yeob as Han Se Kwon (development team leader)
Kim Ga Eun as Seo Na Ri (deputy of planning team)

Research building

Kim Nam Hee as Shin Han Soo
Ahn Nae Sang as Noh Byung Kook
Park Sung Geun as Gong Jung Pil
Park Won Sang as Paeng Soo Gon
Dong Hyun Bae (동현배) as Ki Jung Hyun
Baek Min Hyun as Ahn Joon Soo
Kim Joong Ki as Go Jung Sik
Oh Yong as Pyun Dong Il

Office building

Cha Chung Hwa as Kim Jung Ah
Im Hyun Soo (임현수) as So Sang Wook
Chun Hee Joo (천희주) as Kye Bo Ram
Kim Jin Ho as Bae Jung Tak
Im Il Gyu as Oh Jae Il


Jo Bok Rae as Han Seung Ki
Kang Joo Sang (강주상) as No Jae Yul
Kang Yun Woo (강연우) as Park Hoon Jung


Choi Duk Moon as Kim Young Soo
Kim Yoon Seo as Jung Sung Eun
Yang Jae Hyun (양재현) as Yoo Woo Jong
Lee Sam Woo (이삼우) as Kang Min Koo
Choi Myoung Gil as Choi Hye Soo

Production Credits

Production Company: iWill Media
Director: Choi Jung In
ScriptWriter: Jung Do Yoon

Episode Ratings

    Nationwide Seoul Nationwide Seoul
2021-06-23 1-1 - - 3.0 -
2021-06-23 1-2 4.0 - 3.9 -
2021-06-24 2-1 - - 2.7 -
2021-06-24 2-2 3.9 - 3.3 3.8 (20th)
2021-06-30 3-1 - - 2.7 -
2021-06-30 3-2 - - 3.6 -
2021-07-01 4 - - 3.0 -
2021-07-07 5 - - 3.2 -
2021-07-08 6 - - 3.0 -
2021-07-14 7 - - 3.8 -
2021-07-15 8 - - 2.7 -
2021-07-21 9 - - 3.3 -
2021-07-22 10 - - 3.3 -
2021-08-11 11 - - 3.8 -
2021-08-12 12 - - 3.7 3.7 (18th)
2021-08-18 13 - - 4.0 4.3 (18th)
2021-08-19 14 - - 3.6 -
2021-08-25 15 - - 3.5 3.4
2021-08-26 16     4.3 -

Sources: TNmS Media Korea & AGB Nielsen Korea


Related Photo

(Other Photo from Official Site)

Official Site

Official Poster

Trailer I
Trailer II

Watch Online in Viki.com


  1. 1 : asdasd Says:

    Leave a Comment

  2. 2 : Carmilia Says:

    only saw 2 episodes and I am hook to this one, love his attitude, They will make a good partner at work.

  3. 3 : Jooles Says:

    What an introduction to a drama. Witnessing the end of the road for many staff of a big corporation. Sad scene indeed.

    Its unfortunate that this is the reality of life.

    I have not exactly experienced such a painful exercise before eventhough I have had experienced two company restructurings.

    On reflection, I think I was lucky in that the staffs’ jobs and livelihoods were a priority consideration during takeover negotiations. Meaning, present Employer cared for its staff.

    All staff were happy to take paycuts in order that there were no layoffs. This was one of negotiating points of the takeover.

    In this drama, it appears the work culture in this company is rather impersonal. No staff feels they belong. Ends up the company is just like an arena for survival of the fittest only. How long for, will such an atttitude carry the company thro?, especially thro hard times.

    Its to be noted, “the staff make a company” not the bosses. How strong a company is, does depend on the staff it has.

    As an example : A small eatery’s success does also depends on its staff, maybe 1 or 2 persons only. But they can break or make the business.

    So people, have you at any time stopped to think that you are valuable as an employee? You make the company. So be proud of your job no matter what job it is. And give of your best to it !! Jia you !! Fighting !

    After having watched ep 1 & 2, possibly I might want to drop this drama, unless the storyline improves.

  4. 4 : Miss L Says:

    Same here, also hooked.

  5. 5 : Peejay Says:

    Not sure why rating is low. Maybe because the actors and actress are not top celebrities? I was discouraged by the ratings but when I started watching the 6 episodes available, I could not stop from 1 epi to the next. That’s how good the story and the actors were. Hope others (Korean viewers) will give it a go, because their votes matter. It’s reality at its best, showing the good and bad side. Fighting “On the verge of insanity”!!

  6. 6 : JL Says:

    I am also hook on the serial. Both actors previously acted on many movie screens. I like the story theme. “On the verge of insanity”

  7. 7 : Misu Says:

    The first episode was not so exciting but it get really interesting. It is true that the company pick who you know but not what you know.
    It got me hooked after episode 1. Dang Ja Young and Choi Ban Suk are good match.

  8. 8 : annmasae Says:

    Really enjoying this show. Too bad the ratings are so low.

  9. 9 : Solar Moon Says:

    When is this episode airing and where — what states????

    In the Illinois area MBC is running mostly re-runs.

    This drama, Here’s My Plan, The Spy Who Loved Me, My Master,
    Oh My Ladylord, Dinner Mate, —- not one of these dramas have aired in the Illinois area.

    I am very unhappy with MBC – have no idea why they are not airing and they are only showing re-runs.

    Unhappy Korean Drama Fan.

  10. 10 : Misu Says:

    Episode #11 is getting good revenge! Choi Ban Suk doing a good job to revenge the way his horrible company is not appreciate his ability and skill. Kill the company and be his own boss or find another co. Interesting but sad…

  11. 11 : Diana Says:

    Enjoy watching this drama. Nice break from 120 eps.

  12. 12 : Joom Says:

    #9 Solar Moon

    I would like to say that MBC too had been doing re-runs over here in my country.

    Would suggest not to give up watching their re-runs. Some of these re-runs you will find, are gems too. This was what I discovered. Many have good stories.

    Happy watching !! Enjoy !!

  13. 13 : OK OK OK Says:

    In my opinion This drama is worth watching. I enjoy it very much.
    Waiting for last episodes nbr 16 tomorrow 🙂

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