Luhan is a 20 year old boy who had an accident when he was 19 and forgot his past and the only thing he could remember was his parents. Son-Naeun his first love tried to tell him his past but his parents refused to let him know even though they knew that they had loved each other since 17 they were scared of what would happen to him when he gets to know his past?His friends also try to let him know his past cause they also knew that Luhan and Naeun loved each other. So will his freinds and Naeun be abe to tell him his past or not?