Jeongguk has a crush on Taehyung for a very long time already, but he doesn't know if the other is even gay.  He decides to go to Europe on their one month vacation, to get over him. Unfortunately or fortunately, life has other plans. 

Taehyung sometimes at 4 o'clock, as he looks at the moon, draws in his mind a romantic scenery, where he and his little sunshine, can love each other. 

Jeongguk's never imagined love would come like a flurry of snowflakes, in the middle of winter, and in the form of his beloved best friend.