Krystal Jung, daughter of a wealthy businessman and woman, has to spend 3 months under the same roof with her school mate, Kai Kim, who is known for the hottest boy in town.

They are no crushes, no friends, just acquintances. 

Both of their friends cant know that they're living together.

So, would they be able to handle it?

Its Krystal & Kai : Against the World.