Han Jinyi never knew that she has sibling, to be exact her fraternal twin.

All she knows that her mother divorced long time ago, never mentioned about her father and his fraternal twin whereabouts.

After her mother died because of cancer, Jinyi was left all alone with her alcoholic aunt.

Her aunt couldn’t stand anymore living with Jinyi and deciced to call her biological father to take care of Jinyi.

Jinyi’s story began.

Moving from sunny LA to Seoul and most importantly living with his father and her fraternal twin, Park Chanyeol.

Her life began rolling upside down.

Chanyeol never accepted her existence in the first place.

She struggled to adapt quickly to Seoul’s life.

School was never the happiest place since it was full of a bunch of chaebol’s sons and daughters who wasn’t that easy to get along.

And, another one. Kim Jongin. Just like Park Chanyeol, he is the major headache and troublemaker.

To make it worse, those two seems like mortal enemy

What is happiness? If that kind of word really exist then why my life just screwed up like this? I just hate my life and her presence won’t make any changes –Park Chanyeol

The delight of happiness. Eomma said that we have to find it or even better, make it happens. I try. I will always try my best to find it. Eventhough it’s really... really hard –Han Jinyi

Love is another destructive word I said. Happiness on the other hand is so far to reach. Will I believe those words again, Jinyi?  –Kim Jongin

Three persons with different pains. Will they manage to find the happiness?