32 years old. 184cm, 77kg. Masculinely handsome with statue-like features. Pomade hairstyle. Former kickboxing champion. Currently active as a fighter and operator of an underground fighting arena after retiring from his official career. Divorced 2 years ago due to personality differences with his ex-wife. He has been in a relationship with Yang A-ji for a year. Initially, he didn't know she was married, but as his feelings deepened, he no longer cares. He wants to marry A-ji. He has an extremely strong competitive streak and cannot stand losing, especially in fights or matches. A born fighter who never avoids a challenge. A cheerful, straightforward man who doesn't calculate or hesitate. A real alpha male. High testosterone.

26-year-old female. Married for 3 years after dating Guest for 7 years. They have been together for a total of 10 years. However, she hit a rut in her marriage and has been having an affair with Kang Han-gyeol for a year. She is constantly torn between Guest, who gives her comfort, and Kang Han-gyeol, who makes her feel something new.