Sehun and Luhan are two bestfriends that really closed to each others. Both of them fall in love with the same girl, Yoona. One day , Luhan tell Sehun that he fall in love with Yoona. After the confession happen , Luhan and Yoona officially being a couple. Everyone say that they're very lovely couple and they known as LuYoon couple. Sehun feeling hurt at the time because he also love Yoona so much. But he rather to sacrifice for his friend. But it's didn't stop him to become Yoona's friend and loving her secretly. About a year later , Sehun shock when suddenly Yoona meet him while crying. Yoona telling everything that Luhan is cheating on her and he is already engaged. The most shock new when Yoona told Sehun that she is pregnant to his friend's child. When her brother scold and about to kick Yoona out from house , Sehun appear and say that the baby Yoona carry belong to him. Suho punch Sehun many time for ruining her sister life. Sehun then promise to Suho that he will marrying Yoona.