An assassin named Tae-goo is offered a chance to switch sides with his rival Bukseong gang, headed by Chairman Doh. Tae-goo rejects the offer that results in the murder of his sister and niece. In revenge, Tae-goo brutally kills Chairman Doh and his men and flees to Jeju Island where he meets Jae-yeon, a terminally ill woman. Though, the henchman of the Bukseong gang, Executive Ma is mercilessly hunting Tae-goo to take revenge.

Eun-soo dreams of being a professional writer but in reality, has been jobless for quite a long time. While she is looking for materials to submit a contest exhibition, she gets sick of the annoying noise from upstairs and she wonders what is going on. She begins to watch over the owner of the upstairs and the guy Ho-kyung lives right upstairs, also realizes that Eun-soo is keeping her eyes on him. Eventually, Eun-soo witnessed the staggering truth. Another annoying noise again, the story is only able to exist in imagination, could it be real?