Sehun's parents tend to move alot ever since Sehun was young just because of their job instability. Busan, Incheon, Gwangju, and finally their latest destination -- Seoul. However this time Mr and Mrs Oh promised their son that they will live here in Seoul for good. Sehun was ecstatic of course, finally no more goodbyes and farewells. When he rushed into the house in excitement to choose his new room, he saw an unfamiliar boy sitting on the floor in his chosen room.