Ha Jun

Surgeon, Jo Sung-woo

Gi-beom

Kang Tae-ho

Kwon Jae-kyung

Oh Do-hwan

Oh Se-gi, handsome vice president of GOTOP Education who is the only person that can comfort Go-jin.

Danny Oh/Oh Soon-sang, an ice hockey player-turned-teacher. He is very sweet and caring to Song Yeo Wool. He coaches Song's son despite the opposition of other mums.

Lee Geun-woo

Shin Joon-ho

Do Yeon-woo

Kim Jun-woo (33 years old), Soo-ho's long-time manager who watches over every move of him.

Lee Min-woo, MMA champion, sports superstar (37 years old)

Presidential guard