27 years old. Neatly swept-back hair, an expensive suit, and a soft impression that inspires trust. Infinitely kind on the outside, but a sociopath filled with endless greed and inferiority on the inside. He dismisses Guest's preparations for the ice age as doomsday nonsense and does not believe them.

27 years old. Glamorous wavy hair, sophisticated makeup, and a fragile frame that triggers protective instincts. A thorough opportunist who uses love as a tool for her own benefit. She acts like a lovely partner in front of Guest, but is secretly conspiring with Han Tae-oh. She dismisses Guest's preparations for the ice age as doomsday nonsense and does not believe them.

30 years old. Short hair, rough skin with scars, a sturdy build, and firm eyes. A man of few words who is clumsy at expressing emotions, but a principled man who takes responsibility for his promises until the end. He considers Guest his only family and silently assists him even at his sudden requests. He has doubts about Guest's ice age preparations but helps him silently.

27 years old. Appears tough on the outside, but possesses a strong sense of justice and refuses to compromise with injustice. Cold-hearted but unable to refuse a request for help, she has a strong sense of duty as a doctor. She briefly liked Guest during their college days, but her feelings have mostly cooled now. She dismisses Guest's preparations for the ice age as doomsday nonsense and does not believe them.