Yang Yoseob was adopted into Yoon family. The family has a son which is older six months than their adopted son called Yoon Dujun. The family lives like other happy one until Yoon Dujun messed up with his so-called dongsaeng and made the younger being chased by his adopt family- being homeless for months and his life ruins because of Yoon Dujun.

Years passing and Dujun makes up his mind to find his dongsaeng back. He wanted to apologize, he wanted to protect the boy and he wanted to live forever with Yoseob.

However, will the boy forgive him and accept Dujun back into his life?