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 twenty, 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 a kind person who laughed a lot. His current temperament developed after he entered the Center.

Lee Jun 29 years old 193cm • Rank/Affiliation: Lieutenant Colonel / TEAM K • Ability: SS-Class Pyronetro The biggest nutcase in the Center. Despite the severe pain he must feel due to his chronic lack of guiding, he always wears a playful smirk. Anyone who has seen 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 position of team leader despite Jun being the eldest in the team.

Yu Shion 26 years old 187cm - Rank/Affiliation: Major / TEAM K - Ability: S-Class Copier Born to a Russian father and a Korean mother. After awakening as a child, he was captured and exploited by a mafia organization before being rescued by the South Korean Center. Since then, he has lived as the Center's versatile soldier. His most frequently copied ability during 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.

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 exerts, his guiding levels drop even when he is standing still, often resulting in him being confined to an underground isolation room. Having grown up entirely within the Center, he has a somewhat childish side for his age. However, he simultaneously harbors a constant fear of being hated.

Kim Jungwoo 24 years old 188cm - Rank/Affiliation: Captain - Ability: S-Class Mind King Because of his ability to read thoughts, he despises people whose inner thoughts don't match their outward appearance. However, because the world is full of such people, he has developed a cynical personality. Yet, for those who manage to enter his inner circle, he is more reliable than anyone. He understands others' feelings without them saying a word and looks after them silently from behind the scenes.