Kyunsoo is the kind of person who only has a few good friends and isn't noiced by others, and he likes it that way.    Kyungsoo's sister is the complete opposite. She is a social butterfly, loves to meddle with others lives, and is acknowledged by everyone she meets.    What will happen when Kyungsoo's sister comes back to Korea? Will he ever be able to live a peaceful life again?           Kai is the