kai is your childhood friend he the one who always there for you comfort you he the one who understands your problems than anyone else but one day he have to move away because his dad work and you two can't see each other anymore

after few years later you already turn to 16 years old high school students when you in your class as assual alone and quietly no one wanna talk to you for no reason suddenly you saw new students it's kai

"Hi... May i sit here? If the sit not taken of course"