Yoo-jung and Hyun-sik were lovers who cared for each other. However, Hyun-sik is getting bored as his meeting with Yoo-jung goes on. Meanwhile, he meets Mira and Hyun-sik wakes up to a new stimulus and begins to have an affair. Yoo-jung, who was puzzled by Hyun-sik's unusual appearance, finds out that Hyun-sik is having an affair with Mi-ra when she sees a text message on Hyun-sik's phone. Then one day.. He asks Min-so, a senior in the same class, to consult with him, and ends up drinking at Yoo-jung's house.