Some people have special abilities, in various ways. Jeon Jungkook is gifted with such a special ability. With one passionate kiss, he can kill the person he kisses. Like that, he had made himself a name and lives the life of a cold-hearted killer. But then, he meets Taehyung and falls for him. And it is the first time he thinks of his ability as a curse because he badly wants to kiss the other but can't until he wants to kill him too. Can he resist the strong urge?