Mina was not homophobic, she swore. She had queer friends. When Chaeyoung, her roommate, told Mina she was gay, Mina was absolutely fine with it. So Mina was utterly confused when she started feeling annoyed, resentful, and even disgusted when Chaeyoung started bringing girls home.

Screwing up your rival's business while flirting with them at the same time. That's Kim Kai's modus operandi. Meanwhile, Jongin? He only wishes Do Kyungsoo would disappear. Or so he thinks. Maybe. Going from rivals to business partners to maybe something neither of them saw coming, the three heads of the Korean underworld have more to worry about than just not liking each other, or maybe liking each other a bit too much.

When an aspiring pianist, who is starting to lose hope in her chosen career path, meets a heartbroken well-known orchestra composer who recently fell from grace. The two of them come together to help each other and form an unexpected bond with each other.