3. Weightlifting Fairy Kim Bok-joo (2015-2016)
This is probably one of his most well-known roles, particularly among international fans. He plays Jung Jae-yi, the older cousin of Jung Joon-hyung (Nam Joo-hyuk's character). Jae-yi is a kind and gentle doctor who runs an obesity clinic. Kim Bok-joo (Lee Sung-kyung) develops a crush on him, leading to some humorous and heartwarming moments. He is a supportive figure to both Bok-joo and his cousin, offering advice and a listening ear. This role highlighted his warm and approachable side.