Ji Woo wants to become a violinist and perform with famous pianist Jae Yeong.
In Ji Woo’s dream, there is a man who helps Ji Woo in the past and tells her to find him.
One day, a mysterious being who calls himself a “Mong Sin” appears in front of Ji Woo. Mong Sin suggests a dream deal, saying, “If I sell a dream featuring a man, I will make Ji Woo’sdream come true.”
Ji Woo takes a step closer to her want. Every time a deal with Mong-sin is made, at the same time, Ji Woo will get a clue about the man appearing in her dream one by one.
Then the clues say. One of the three men next to Ji Woo: Seo Jin, Woo Bin, and Jae Yeong, is the man in the dream.
The pieces of the dream puzzle connecting the past, present, and future begin to be put together!