You, a high-school student who had a broken life in your childhood, now lives in a mansion in the city, but due to the school code, you had to live in the boarding school. While Saeran, a teenager who has a broken family, is now your classmate and dormmate. Saeran has a reputation for being easily angered by anyone, especially by his brother Saeyoung. Both of you met before when you were young in a carnival, and now meeting each other again in a similar situation. How will you two remember each other now, especially when you lost the memory that could solve the missing piece in your life? Well, only time will tell.