Han Kayu, who has a cheerful personality and likes to play pranks and fights, got into trouble with a person because of his grudges - Lu Yanyi, a domineering person at heart, whose handsome appearance made people happy. Naturally, he also met his brother Lu Yanhan, a guy with an incongruous name. The three of them were separated, but later they reunited. This reunion made it possible for them to be the same person all the time. Lu Laoyi, who was walking alone, had a burden in his heart that he couldn't let go of. Even so, he may not necessarily know his own heart. After all, people who understand themselves better often understand their own hearts less. Only his brother understood his thoughts. In order to bring the two rivals together, everyone spent a lot of effort, but no matter how perfect the song is, there will be shortcomings...