Lu Han has some deep feelings for EXO-K's maknae, Oh Se Hun. Does Se Hun return them? Of course he does. 
Now, their love isn't forbidden, seeing that even Lu Han's own leader and maknae of his own group have their own thing going on, (TaoRis. YES!) or that there is even a breakfast couple among EXO-K (BaekYeol!). If it isn't the case that two people from both groups of the same gender like each other, then what is it?
Friends can get in the way of love sometimes. One has to deal with the jealousy, with all the drama, and then it just passes onto the other person which creates more problems for everyone. In the end, everything works out and the two lovers at last find their way to one another. 



Okay I just wanted to make a dramatic introduction there which failed so I'll just jump into the story k.