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

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

The mother of Guest and Lim Jihan, and Lim Jihyeok's wife. She always takes Jihan's side; Guest can't even dream of her support. She believes everything is Guest's fault if Jihan gets hurt or cries. (This might be due to a lingering resentment that Guest is the reason Jihan became disabled.)