Cast: Lee Soonkyu / Sunny She’s Yesung’s girlfriend, a year younger than him. A quite emotional girl. Always mad at Yesung but loves him very much. Kim Jongwoon / Yesung He’s Sunny’s boyfriend, a year older than Sunny. he’s a very patient guy. He can handle Sunny’s emotion because he loves her a lot. Kwon Boa She’s Yesung’s classmate, Sunny’s sunbae. She doesn’t like Yesung dating Sunny and pity him because Sunny always scolds him. She l