Best friends Yoo and Joon-hee meet transfer student So-yeon. Her beauty immediately catches the duo's attention, creating a love triangle among them.

Go-yoo and Joon-hee keep running into So-yeon; Joon-hee's dizziness seems to get worse and worse each day.

After getting beaten up, Joon-hee is taken to the hospital and finds out that he has chronic kidney disease like his brother.

Joon-hee feels left out as Go Yoo and So-yeon begin to show affection towards each other; Go Yoo invites So-yeon to a secret wine party with his friends.

Joon-hee is confused about what is going on with his body and mind; Go Yoo discovers So-yeon's secret.

Go Yoo feels disappointed in So-yeon when he finds Ms Mo's necklace in her bag; Joon-hee tries to emulate Go Yoo's behavior.