Love is a blissful feeling.
It makes you feel happy and positive all the time.

But it also makes you nervous and scared.
Especially when it's your first time to experience it.
You lose your mind. You lose focus. You lose all the control.
No matter how intelligent and bright you are, when it comes to love... 
You get dumb. You become stupid.

And if you're hurt...

You change. Not just any kind of change.
But a 180-degree personality change.

That's Baekhyun's case.
He fell in love. Fell in love for the first time.
But she broke his heart. 
Now, Baekhyun wants revenge.
And he'll do that through change.

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"Eye for an eye... Tooth for a tooth... Heart for a heart. I'll make her fall for me then I'll dump her in exact same way that she did."