Swapping Between Cohabiting Couples

A couple, Hee-soo and Seong-ha, have grown distant from each other after living together for a long time. Hee-soo is just waiting for the right moment to break up with her boyfriend, while Seong-ha brings women into their house whenever his girlfriend goes out. Then one day, Hee-soo’s life begins to change when Do-hoon shows up.