You ( Kimberly ) and JeongMin study in a school in Singapore and you're in a relationship . MinWoo is a student and he recently joined your class . KwangMin and YoungMin are your cousins while HyunSeong is your brother . KwangMin , YoungMin and HyunSeong are all in the same school as you . But HyunSeong is in Secondary 3 while KwangMin and YoungMin are in Secondary 2 . You had an accident and you lost your memory about your relationship with JeongMin and you start to fall