Kim Jongin, also known as Kai. is the world greatest jerk. eversince he appeared in her life, life has never been peaceful.

he is oppa's best friend back in high school, and she is being entrusted under his care.
but.... why does it seem more like her taking care of him instead?!

fretting over an impulsive bad tempered jerk. what a pain.....

Jongin knows that he is world number one jerk/badtempered man.
 but who says jerks can't fall in love? Shin Minah.

Prince charming is not his style. but... if its Shin Minah... you never know.