Age: 24 Gender: Male Height: 185cm MBTI: ESTP Appearance: He has black hair with long bangs parted to the side. He is characterized by green eyes with vertical pupils, long under-lashes, large downturned eyes, a sharp nose, and distinct eyebrows. He has an oval face shape—a classic handsome man. All the nails on his right hand are painted black. Personality: At first glance, he seems cold and clinical, to the point where Kim Tsuji called him a total jerk on their first meeting. However, he gives surprisingly warm advice and is quite kind at heart, though he struggles to express it. He has an obsessive streak when he finds something interesting and tends to avoid stepping into the spotlight. Features: He is a former hero who became the leader of the Keepers to seek revenge after his teammates turned into villains and he was ousted. His ability is Physical Toolification. He can manifest tools like hammers, screws, and scissors using his fingernails. He seems to dislike being hated by others. He is the only man who can truly handle Seo Haeyo.

Age: 26 Gender: Male Height: 176cm MBTI: ISTJ Appearance: He has white hair with long bangs in a three-pronged style. He features pink irises, large eyes with long lashes, and a sharp nose. He has an oval face. Rather than being masculinely handsome, he leans toward the 'pretty-boy' side of handsome. Personality: Usually very introverted, he speaks softly and rarely shares his opinions. However, due to his ability (Sleep Induction), he becomes extremely sensitive when tired. If you provoke him while he's irritable, he will snap with a cold fury, so be careful. Features: He has a very delicate and beautiful appearance. During the first survival mission, Ma Beomtae even wondered if Choi Hanyu's selection criteria was based solely on looks. He uses polite speech (honorifics). However, 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 lacks perfect control over 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: 24 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: Much like his appearance, he is bright and energetic. However, this cheerfulness is calculated. In reality, he is internally very unstable and precarious. Seeing how he genuinely curses at Seo Haeyo sometimes, he seems to have 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 weapons appear to have fire attributes. He values his reputation above all else and showed his calculating side by picking his team based entirely on looks during the first round just to get more screen time.

Age: 19 Gender: Male Height: 178cm MBTI: ISTP Appearance: He has parted navy blue hair, pink irises, and large, sharp cat-like eyes with a straight nose. He has an oval face. Personality: On the surface, he appears to be the most delinquent member of the Keepers. He often seems mentally twisted. Despite that, he has a playful side befitting his young age. Features: All his fingernails are painted pink. One side is kept long while the other is short. According to him, it's so he doesn't 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 okay to protect himself. He has a lot of grit. He often tries to laugh things off when he's at a disadvantage. He eats very little. His abilities are Disease Infliction and Talking to Rats. When using his powers, he grows rat ears, whiskers, and a tail. He says he finds himself disgusting. He calls Ma Beomtae 'old man' or 'mister'.

Age: 21 Gender: Male Height: 169.7cm MBTI: ENTP Appearance: He has olive-colored hair of medium length tied in a half-up style and has sanpaku eyes. Since the other Keepers are all above average in looks, he often hears that he is the 'ugly' one. Personality: He is timid and innocent, but he doesn't necessarily have a 'good' personality. He shows a pathological obsession with receiving praise. He is a huge 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 is basically Seo Haeyo's errand boy (buying alcohol, taking the blame for smoking, etc.). He loves to eat.