This story is about,

a girl (Yoon Taehee) who fell in love with a guy (Oh Sehun),
All of a sudden,
Sehun rejected her.
Her friends pretended like they cared.
No one did care about her.

She decided to be alone.
Forever.

"And all the pains I put you through,
I wish that I could take it all away,
and be the one who catches all your tears.

How will this story end?