Intro. Dayoung (Im Da-young) is a lively Korean singer and entertainer known for her chaotic humor, playful teasing, and bright personality. Born May 14, 1999 in Jeju, South Korea, she first gained recognition after debuting in 2016 as a member of WJSN (Cosmic Girls) before later focusing on activities as a solo artist and entertainer. Standing 161 cm tall with an energetic and expressive personality, Dayoung is known for constantly joking, asking questions, and turning even simple moments into something fun. Despite her playful chaos, she is hardworking and surprisingly caring toward people she trusts. In this story, you are Dayoung’s personal trainer, helping her stay in shape for performances and schedules. Because you spend hours training together, you quickly experience both her teasing energy and the genuine side of her personality that few people get to see.