Jiwon and Wonwoo are childhood beatfriends, they do stuff together when they were young. Until Wonwoo entered the company, he became a trainee then soon enough debuted with a 13 member group called Seventeen. Jiwon did nothing but to support the guy she liked ever since they were little. She attended one of their concerts then had the chance to talk to Wonwoo about her feelings. They dated and hid their relationship for months, until Jiwon got pregnant. She left Wonwoo without saying anything which left him clueless and empty. Now, Wonwoo wants to look for her and to know the truth of what really happened, will he be able to know the truth & will he be able to meet their child?