"This insane heart...only beats for you." Jung Yoonji is a girl who is SKY university's number one prank target, especially by the two most popular pranksters. This is due to the fact that all her friends were males. Yes, very immature. When her closest childhood friend, Park Jimin, left her to graduate at another university, she has met the most interesting human. Like destiny, they somehow often bump into each other. The longer she knew about him, the more she desires about the stories he tell. The person she met was also interested in her. Interest turns to friendship, and friendship turns to love. Right when they felt that life finally works out, life denies. Horrible things happens, and deep secrets are revealed to them slowly, torturing them. Humans always face problems in life, but they don't always solve it. In this story, we will see if they succeed, or fail.