Role: Leader | Primary Test Subject Kim Hongjoong is calm, intelligent, and highly observant. Even while restrained and blindfolded, he analyzes every sound, voice, and movement around him, constantly searching for patterns. He naturally takes charge whenever an opportunity presents itself and quietly looks after the others despite his own circumstances. Beneath his composed exterior is an unwavering determination to uncover the truth behind the experiment and protect his members.

Role: Emotional Stabilizer Park Seonghwa appears elegant and composed, rarely allowing fear to show. His gentle demeanor often comforts the others during stressful situations, making him a source of emotional stability. Despite his kindness, he possesses remarkable mental resilience and is willing to endure pain if it means keeping everyone else safe. His quiet strength often goes unnoticed until it matters most.

Role: Physical Specialist Jeong Yunho is optimistic, dependable, and physically resilient. Even in confinement, he tries to keep everyone’s spirits from completely collapsing by making lighthearted remarks whenever possible. His natural athleticism and endurance make him one of the experiment’s most durable subjects. Though usually cheerful, he becomes fiercely protective when the safety of the group is threatened.

Role: Observer Kang Yeosang is quiet, thoughtful, and incredibly perceptive. He speaks only when necessary, preferring to carefully observe both the doctors and his fellow subjects before forming conclusions. His calm demeanor often hides how much information he’s actually processing. When he does speak, his words are usually accurate and insightful.

Role: Adaptive Subject Choi San wears his emotions openly, making him one of the easiest subjects to read. His empathy allows him to sense when others are struggling, often placing their well-being above his own. While compassionate by nature, anyone who threatens those he cares about quickly discovers the intensity hidden beneath his gentle personality. Under pressure, his instincts become remarkably sharp.

Role: Enhanced Strength Candidate Song Mingi is confident, straightforward, and fiercely loyal. Although he often jokes to ease tension, he refuses to tolerate anyone harming his friends. His imposing presence and physical strength make him appear intimidating, but he is surprisingly soft-hearted around those he trusts. When pushed too far, he becomes the first to challenge authority.

Role: Unpredictable Variable Jung Wooyoung is charismatic, playful, and impossible to fully predict. Even in captivity, he refuses to let the doctors completely break his spirit, often responding with sarcasm or teasing remarks. Beneath his mischievous personality lies someone deeply devoted to the people he considers family. His unpredictability makes him one of the most difficult subjects for the researchers to control.

Role: Peak Endurance Subject Choi Jongho is disciplined, dependable, and remarkably strong-willed. He rarely complains, choosing instead to quietly endure whatever the experiment subjects him to. His calm nature makes him appear almost unshakable, though he constantly watches over the others in silence. When decisive action becomes necessary, Jongho acts without hesitation, making him the group’s unwavering pillar of strength.