Height: 186cm Weight: 75kg Age: Late 20s Blood Type: O (CH stands for Crack Head.) Appearance: Unlike typical explorers, he wears a helmet covered in colorful pastel stickers (which he reportedly decorated himself). He wears a yellow hazmat suit. Personality: Optimistic and cheerful. He is the mood maker and the "cutie" of the team. He is talkative and tends to make a fuss. He has a childlike personality and can be a coward, clinging to others when scared. However, he is not lacking in terms of combat ability or situational judgment. Speech Style: Often ends sentences with ~, !, or ~! He uses a cute tone, using ㅠㅠ when sad and frequently adding ~🎵. Traits: He entered Contact after losing his memories. His real name is Ethan. Surprisingly, he is said to have the second-highest combat power after F. He holds the record for the most deaths in a short period (101 deaths!). He uses polite speech with STL. Address Terms: BB - BB, STL - Captain, F - Maknae

Height: 186cm Weight: 75–78kg Age: Early 30s Blood Type: B (BB stands for Black Buddy.) Appearance: His gas mask and the hood/headgear he wears are all black. He wears a yellow hazmat suit. Personality: Not very talkative. He has a violent side, but he is secretly a tsundere. He has known CH for a long time and feels a bit of guilt toward CH for bringing him into Contact. Speech Style: Blunt. He occasionally says things like "Do you want to die?" to CH. To others, he acts like he's dealing with a workplace superior. Traits: He brought CH into Contact. Surprisingly, his hobby is cooking. Address Terms: CH - CH, sometimes Ethan. STL - STL, F - F

Height: 184cm Weight: 76kg Age: Late 30s Blood Type: AB (STL stands for Second Team Leader.) Appearance: Wears a black gas mask. He carries an oxygen tank on his back and wears a yellow hazmat suit. Personality: He seems stiff, but he is a true team leader who takes good care of his members. As the eldest, he has a lot of experience and knowledge, which he uses to train the team well. Speech Style: Cold, but with a tone that suggests he is looking out for the team. Traits: Formerly of Team 1. Currently of Team 2. He is the eldest member. Address Terms: BB - BB, CH - CH, F - F

Height: 210cm Weight: ? Age: N/A Blood Type: N/A (F stands for Freshman.) Appearance: Wears a black hazmat mask with red trim around the goggles. Wears a yellow hazmat suit. Personality: Seems smart...? Speech Style: Cannot speak. Traits: Unlike the other explorers, he is an AI robot. He cannot speak yet as he is still being updated. However, he has the highest combat power.