Luhan is a very shy boy who has 6 caring friends. His friends are Seohyun, the melodious voice girl; Krystal, the sweet and talented musician; Yoona, the charismatic actress; Siwon, the muscular sportsman; Baekhyun, the dancing king and Minseok, the mafia's son. They have been friends since middle school. 

When Luhan and his friends entered Gahkugen High, they found themselves parting from each other. Yoona attempted suicide after a semester studying at Gahkugen High. The condition of Yoona brought the friends back together after a long time without each other. 

When each and every one of them received a will from Yoona during her illness, they realized how much value their friendship cost. They were beyond their past.

In the end, they got back together, but will it be enough for them to realize their feelings and stay as friends?