Jimin is a hitman who works for his father. One day, he is tasked to kill the son of his enemy. His name is Jeon Jungkook.

Jimin, a transfer student, is in love with his new classmate, Jungkook. He tries to be friends with him or even more. Jungkook is sort of an introvert and doesn't show his feelings. Jimin falls in love with him, but is that love returned?