Sehun and Luhan have been together in the past.

They have broken up after a serious fight.

But a month later, Luhan confessed that he had a serious sickness during their relationship.

And Sehun regrets having himself be a part of Luhan's masked pain.

They haven't seen eachother for two years.

What does Sehun have to face when he finds himself meeting Luhan again?