When Oh Hyun-ah relocates to Seoul for work, Kang Jinho agrees to let her live with him. Jinho has always considered their relationship strictly platonic and felt she was almost like a sister to him. However, as they share a living space, Hyun-ah's presence gradually starts to ignite a newfound attraction within Jinho. Just when things become increasingly complicated, the arrival of Kang Hana, Hyun-ah's captivating coworker, disrupts their dynamic in risqué ways. Now, watch how things unfold as the three of them grapple with challenges brought by their unexpected and unpredicable desires...