This drama depicts a pure and beautiful love story at 3 a.m., relatable because it feels like my own heart, and comforting because it feels like I'm not alone. Minwoo, having broken up with his long-time lover, Jaehoon, a close friend who's experienced the same thing, shares a heartfelt, drunken conversation about love. He then realizes that Jaehoon and Minyoung's relationship shares similarities with Minwoo and Sooah's. Minwoo and Jaehoon both still yearn for their past relationships. Sooah, who has broken up with Minwoo, continues her normal daily life with her close friend, Heejae. Then, with the arrival of Yeri, who has taken a liking to Heejae, their relationship begins to take a turn for the worse...