Sun: a self-luminous heavenly body; star.

Kim Lyorin's quest to find the missing puzzles of her life is not without pain, struggles and sacrifices. Her life is like a blank diary, waiting for its content.

Just when she thought her past is nothing but blank pages; slowly the diary is filled. 

Filled with sweat, tears & blood

The same person who erased all the pages, is the same person who is filling it.

He thought he could hide the painful past forever. He thought he could protect her forever. 

But no...

People are hunting for the diary;

Hunting for her life

because ~

"Seek the Sun for it shines as the brightest Star"

She is no ordinary Star.

And then we have EXO acting as half of the hard cover to the diary.

Is it enough?

Are they strong enough?

Wait a minute..

What?

Half of the hard cover??

ONLY HALF???