To love someone for a long time and not to feel loved back...

It's painful.

To love someone but to help him with his love instead...

it's excruciating.

When Luhan fell for Sehun that many years ago...

he was happy.

For him to put his love aside and help Sehun instead...

it's his duty.

Nothing more than just friends. 

Luhan :

He has the softest heart, wanting to help everyone he knows, he doesn't know how to say no to anyone, always trying his best to help them. He has been helplessly in love with Sehun for years. Only that he didn't dare to speak up, fearing what Sehun might think of him. Luhan also has a weak immune system,  causing him to fall sick easily, but he actually doesn't mind too much, knowing that Sehun always cares for him then...he feels it's the only way he can get Sehun's attention.

Sehun: 

A warm guy, hard to make friends with him in the start because he doesn't warm up easily to anyone. He has a soft spot for Luhan, being close to him since young. He has a protective side for him but has never known that Luhan loves him. He never thought of Luhan in a romantic way before. He has many admirers in school but they are not those crazy sasaengs.