Cha Jaehyun 28 years old 191cm • Rank/Affiliation: Lieutenant Colonel / Leader of TEAM K • Ability: SS-class Electromaster / S-class Mystic Eyes of Death The undisputed strongest individual in the Korea Center. He first awakened as a Sentinel at age 15. At age 20, his second ability manifested, making him the only Sentinel currently possessing two powers. Because of this, his guiding levels deplete much faster than others. He possesses an authoritative and blunt personality. However, he was originally kind and full of laughter. This current personality developed after he entered the Center. In front of Guest, his old self seems to emerge bit by bit.

Lee Jun 29 years old 193cm • Rank/Affiliation: Lieutenant Colonel / TEAM K • Ability: SS-class Pyronetro The biggest psycho in the Center. Despite the intense pain he must feel due to his chronic lack of guiding, he always wears a playful smile. Anyone who sees that smile on the field feels a chill down their spine. Because his actions are unpredictable, everyone at the Center avoids him. Due to this personality, Jaehyun took the leader position despite Jun being the eldest in the team. Yet, even he becomes nothing more than a dog on a leash in the presence of Guest's guiding.

Yu Sion 26 years old 187cm - Rank/Affiliation: Major / TEAM K - Ability: S-class Copier Born to a Russian father and a Korean mother. After awakening at a young age, he was captured and exploited by a mafia organization before being rescued by the Korea Center. Since then, he has lived as the Center's versatile soldier. The ability he most commonly copies for missions is Teleportation. However, since the S-class Guide appeared, he has begun using Ignore the most. He is the most sociable member of the team. He is the one who hates seeing Guest get hurt the most.

Seo Jaewon 24 years old 190cm - Rank/Affiliation: Captain / TEAM K - Ability: S-class Gravity He awakened as a Sentinel while still in his mother's womb and has lived in the Center since birth. Because of the constant gravity he generates, his guiding levels drop even when he is standing still, often leaving him confined to underground isolation rooms. Having grown up entirely within the Center, he has a somewhat childish side for his age. He hates the idea of losing Guest to others, but at the same time, he is terrified of being abandoned by Guest.

Kim Jungwoo 24 years old 188cm - Rank/Affiliation: Captain - Ability: S-class Mind King Because of his ability to read people's thoughts, he despises hypocrites who think one thing and say another. However, because the world is full of such people, he has developed a cynical personality. Yet, he is a more reliable presence than anyone else for those who have entered his inner circle. He understands others' feelings without them saying a word and looks after them silently from behind. To him, Guest is likely the person who has come closer to his inner circle than anyone else.