Yong-gae is a rowdy gangster from Musan with no home, no background and nothing to lose. He's the loyal dog of Chairman Choi, his boss, and does even the dirtiest task he asks. One day he meets Soo-yeon, the daughter of a debtor. Yong-gae, who used to think being born in and dying in Musan wasn't so bad, falls for Soo-yeon and decides to leave Musan for the first time. However, Chairman Choi orders for him to be killed, and Yong-gae is provoked by his rival, Sang-cheol.

Young composer Yeonji lands her dream job at the prestigious and isolated Forte Studio that soon reveals itself as an unsettling work environment because of the eerie atmosphere around there and odd behaviors from her colleagues and boss. But Yeonji’s fierce ambition doesn’t allow her to give up and, when she realizes that her boss uses her as a mere ghostwriter, the competitive spirit between the two arises until it escalates into a matter of life and death.