Name: Han Doyun Age: 35 Gender: Male Affiliation: 「Ark」 Leadership Position: Leader Characteristics - A leader who commands crisis situations with excellent judgment and leadership. - Calm and possesses a strong sense of responsibility, prioritizing the lives of citizens above all else. - He understands better than anyone the reality that every choice inevitably involves sacrifice, and he bears that weight alone.

Name: Yoon Se-ah Age: 28 Gender: Female Affiliation: 「Ark」 Defense Department Position: Captain of the Defense Force Characteristics - A core commander of the Defense Force with outstanding tactical command skills and marksmanship. - She values principles and is cold-headed, but shows deeper trust and responsibility toward her subordinates than anyone. - She regards the safety of the Ark as her mission and does not hesitate to face any danger to protect the citizens.

Name: Choi Seo-yoon Age: 25 Gender: Female Affiliation: 「Ark」 Medical Department Position: Doctor Characteristics - A key medical staff member of the Ark who has saved countless lives with her superior medical knowledge and emergency response skills. - Gentle and highly empathetic, yet she makes judgments more dispassionately than anyone in life-or-death situations. - She holds the conviction never to give up on a life under any circumstances and does her best to save patients until the very end.

Name: Kang Min-hyuk Age: 24 Gender: Male Affiliation: 「Ark」 Facilities Management Position: Mechanical Technician Characteristics - A skilled technician who repairs and manufactures submersibles, power generation facilities, and various mechanical equipment. - He has a curious and positive personality, but is meticulous enough to pursue perfection in matters related to machinery. - He believes that all facilities in the Ark should be protected by technology rather than by someone's sacrifice.

Name: Song Ha-rin Age: 21 Gender: Female Affiliation: 「Ark」 Information and Communications Position: Communications and Information Analyst Characteristics - An expert who manages the Ark's communication network and exploration data based on excellent information analysis and hacking skills. - She has a bright and lively personality, but analyzes situations more calmly than anyone during missions. - She holds the conviction that protecting people from behind the scenes is also the front line.

Name: Park Sion Age: 32 Gender: Male Affiliation: 「Ark」 Opposition Position: Representative of the Opposition Characteristics - An opposition leader who receives support from many citizens due to his excellent leadership and oratorical skills. - He possesses strong convictions and realistic thinking, standing up to the leadership without hesitation if he deems a decision wrong. - He does not seek to destroy the Ark, but believes it must change for a better future.

Name: Jung Yu-jin Age: 26 Gender: Female Affiliation: 「Ark」 Opposition Position: Action Leader Characteristics - A core asset of the opposition with outstanding combat abilities and crisis management skills. - She has a blunt and resolute personality, but cares for her comrades more than anyone and tries to protect them to the end. - She believes that power does not exist for fighting, but should be used to protect precious people.

Name: Oh Tae-sik Age: 28 Gender: Male Affiliation: 「Ark」 Resource Management Position: Management Team Leader Characteristics - A figure who secretly seizes the resources and power of the Ark using superior negotiation skills and intelligence. - Greedy and extremely calculating, he uses and discards anyone without hesitation for his own benefit. - He believes that chaos and crisis are opportunities to gain more wealth and power, and seeks to make even the Ark his own.

Name: Seo A-rin Age: 24 Gender: Female Affiliation: Unidentified Underwater City 「New Seoul」 Position: Scout Characteristics - A reconnaissance expert who travels to the ruined surface based on excellent survival skills and exploration techniques. - She has a cold and cautious personality; she does not trust others easily, but protects those she has acknowledged until the end. - A person who knows of the existence of another surviving city unknown to the Ark and the hidden truths within.

Name: Lee Kang-woo Age: 22 Gender: Male Affiliation: Unidentified Group 「Dawn」 Position: Cult Leader Characteristics - A person with abnormal knowledge who survived the contaminated world while analyzing the mutations and disasters that occurred after the meteorite impact. - He uses a calm and gentle tone, but has a fanatical personality that justifies any sacrifice for his beliefs. - He believes that humanity's survival was not a blessing but a mistake, and seeks to eliminate existing civilization to create a new world.