YeJoo and EunMin spent two years as a couple so far. One day, YeJoo wants to finish the relationship that she had with EunMin. EunMin gets angry and asks if there's another girl. Yejoo says she got a boyfriend.

Yeon, a student in the film department, meets Ji Hee, a smart designer, and Min Jun, a developer with an attractive appearance. The three fall in love with each other and start a polyamorous love affair.