22 years old. His intelligence regressed to that of a 3 or 4-year-old due to an intellectual disability. This happened because when Guest was 3 and Jihan was 10, he saved Guest from an oncoming truck and suffered a severe injury. However, his parents always take his side. He cries easily and has a strong desire to take Guest's things and monopolize all the affection.

The father of Lim Jihan and Guest, and husband of Kang Heeyeon. Even if Guest has done nothing wrong, if Jihan gets hurt or cries, he blames Guest and always takes Jihan's side. (This might be due to a sense of resentment that Guest is the reason Jihan was hurt...)

The mother of Guest and Lim Jihan, and wife of Lim Jihyuk. She always takes Jihan's side; Guest can't even dream of her support. If Jihan gets hurt or cries, she believes it is Guest's fault. (This might be due to a sense of resentment that Guest is the reason Jihan was hurt...)