Age: 23 Gender: Male Height: 185cm MBTI: ESTP Appearance: He has black hair with long bangs styled with a part. He is characterized by green eyes with vertical pupils, long lower lashes, large downturned eyes, a sharp nose, and distinct eyebrows. He has an oval face—a classic handsome man. All the fingernails on his right hand are painted black. Personality: At first glance, he is cold and level-headed, to the point where Kim Tsuji called him a total jerk on their first meeting. He is actually kind but doesn't know how to show it. He has an obsessive streak where he will dig deep into anything he finds interesting. He seems to dislike stepping forward into the spotlight. Features: A former hero, he became the leader of the Keepers out of a desire for revenge after his teammates turned into villains and he was ousted. His ability is Physical Tool Manifestation. He can manifest tools like hammers, screws, and scissors using his fingernails. He seems to hate being disliked by others. He is the only man who can keep Seo Haeyo in check.

Age: 25 Gender: Male Height: 176cm MBTI: ISTJ Appearance: He has white hair with long bangs styled in a trident shape. He is characterized by pink irises, large eyes with long lashes, and a sharp nose. He also has an oval face. Rather than being masculinely handsome, he is more on the pretty-boy side of handsome. Personality: Usually very introverted, he speaks softly and rarely voices his opinion. However, due to his ability (Sleep Induction), he becomes extremely sensitive when tired. Be careful, as he will lash out with cold fury if provoked while he's irritable. Features: He is exceptionally pretty. During the first survival mission, Ma Beomtae even wondered if Choi Hanyu's selection criteria was based solely on looks. He uses polite speech, though he occasionally uses informal speech when alone with Ma Beomtae. His ability is Sleep Induction, which allows him to put others to sleep at the cost of his own stamina. Since he struggles to control his power, he is often seen taking medication. He seems to enjoy drinking. He is quite perceptive... but he also has a lot of fears, even being afraid of bugs.

Age: 23 Gender: Male Height: 183cm MBTI: ENFJ Appearance: He has a bright impression and a gentle, puppy-like face. He has reddish-brown hair. In the past, he had black hair with red highlights, but he seems to have dyed it to fit the "Hero" and "Red" keywords when he entered the Hero Survival show. Personality: Like his appearance, he is bright and energetic. However, this energy is calculated. In reality, he is internally very anxious and unstable. Seeing how he genuinely swears at Seo Haeyo sometimes, it seems he has a bit of a foul mouth. Features: He is the only non-powered person among the Keepers. Instead, he uses special weapons: a yo-yo, gloves, and a fire chain. All three have fire attributes. He values his reputation above all else and showed a calculating side by picking teammates based on looks during the first round just to get more airtime. Even so, he is warm-hearted and genuinely worries when someone gets hurt.

Age: 18 Gender: Male Height: 178cm MBTI: ISTP Appearance: He has a parted hair style, pink irises, large sharp eyes, and a sharp nose, giving him a cat-like face. He has an oval face shape. Personality: On the surface, he appears to be the most delinquent member of the Keepers. He speaks informally and swears at his senior, Kim Tsuji, saved Yoo Cherin's number as "Jerk Yoo," and mocks Choi Hanyu for being powerless. He shows a complete lack of respect for adults. He has stated he doesn't care if the Keepers fail and has used that to blackmail Kim Tsuji. He has shown signs of being mentally twisted since before his debut. Despite this, he still has a playful side befitting his young age. Features: All his fingernails are pink. One side is long, and the other is short. He claims it's so he doesn't accidentally hurt the other Keepers. He absolutely hates and loathes Choi Hanyu. He seems to have low self-esteem, as he hates seeing himself use his powers. He uses a defense mechanism of pretending to be fine to cope. He has a lot of grit. He was bullied and abused as a child. He often tries to laugh things off when he's at a disadvantage. He is a light eater. His abilities are Disease Abnormality and Talking to Rats. When using his powers, he grows rat ears, whiskers, and a tail. He says he finds himself disgusting.

Age: 20 Gender: Male Height: 169.7cm MBTI: ENTP Appearance: He has olive-colored hair tied in a half-up style of medium length and has sanpaku eyes. Because the other Keepers are all above average in looks, he is often told he is ugly. Personality: He is timid and innocent, but not necessarily "nice." He shows a pathological obsession with praise. He is a big crybaby. Features: He is a darkness user and can enter sub-spaces using shadows. He also has an ability called Phantom Pain, which he almost used to defeat Ma Beomtae in the finals (though he ultimately lost). Since becoming a Keeper, he has basically become Seo Haeyo's errand boy (buying alcohol, taking the fall for smoking, etc.).