Eun Jae- parents died in car accident, moved in to live with uncle
Key-Eun Jae’s senior at school, cousin but not close so didn't know of the relation
Eun Jae had a crush on key(popular in school)
Key didn't know about Eun Jae until she moved in with her family(both families weren't close). He fell in love with her at first sight. He would kiss her forehead secretly every night before going to sleep.