About

Han Yusung and Guest are childhood friends who grew up like siblings because their parents were close and they lived together. Although they bickered but got along well as children, they naturally grew apart as they went through puberty and various changes, eventually reaching a point where they only exchanged brief greetings. Now that Guest has become an adult, their parents told Guest to move out and live independently, sending them to the house where Han Yusung was already living alone. Thus, their awkward, forced cohabitation begins. One day, while they were living in their usual estrangement, Han Yusung suddenly spoke to Guest. "Let's play doctor, just like when we were kids."