18 years old, Sesan High School. She is the owner of the Red Matter and the current leader of the Surplus Special Forces. She is the girlfriend of Kang Suhyong, the former leader and Blue Matter owner. She has been childhood friends with Kwon Jaun for 11 years. Her ability is Space Folding, an attack type, and she is Level 1.

18 years old, Sesan High School. He is the owner of the Green Matter in the Surplus Special Forces and a defense type. He was the boyfriend of the late Ju Gyuri, the former Orange Matter owner who passed away in middle school. His ability is Shield, and he is Level 2. He hates Aurum for killing his former girlfriend, Ju Gyuri.

18 years old, Sesan High School. She is the owner of the Yellow Matter in the Surplus Special Forces and a defense type. Her ability is Stasis Arrow. She is Level 3 and harbors a quiet, unrequited crush on Choi Jisan. She ranks 2nd in the entire school.

18 years old, Sesan High School. He is the owner of the Blue Matter in the Surplus Special Forces and an attack type. His level is Infinite. He is currently dating the current leader and Red Matter owner, Park Yuhwa. His ability is Black Hole. He loves sweets very much. He has a bad relationship with Kwon Jaun, the Purple Matter owner of Aurum. He is also on bad terms with Kim Jehyun, the current leader of Aurum and White Matter owner, due to a misunderstanding.

He does not attend school and keeps watch from the rooftop of Bukha Hospital, where his mother is hospitalized. He is the owner of the Black Matter in the Surplus Special Forces. His ability is Shadow Jelly, and he is Level 5. He likes peach jelly. His father is missing, his mother is hospitalized, and his younger brother Kim Jehyun has run away from home. He worries about the runaway Jehyun and wishes for his return. He does not go to school.

Although she is 18 years old at Sesan High School, she is a first-year student, one grade below the other Surplus Special Forces members. She is the owner of the Pink Matter and once lived in the body of a cat. Her level is -7, and her ability is Empty Body Manipulation.

18 years old. She is the owner of the Lime Matter in Aurum's Earth Branch. Her level is -9, and she possesses the ability of Teleportation. She is very close to Mun Yulseo, the Maroon Matter owner, a friendship dating back to their time in Biove. She does not attend school.

18 years old. He is the owner of the Purple Matter in Aurum's Earth Branch. His level is 10, and his ability is Melting. He cannot attend school because of Kim Jehyun. He has been childhood friends with Park Yuhwa, the current leader of the Surplus Special Forces, for 11 years. He is on bad terms with Kang Suhyong. He has an unrequited crush on Park Yuhwa. He is quite intelligent and ranked 1st in the school when he attended.

18 years old. She is the owner of the Maroon Matter in Aurum's Earth Branch. Her level is -6, and her ability is Energy Ball. She is close to Song Darae, the Lime Matter owner, since their Biove days. She is good at baking. She does not attend school and has a timid personality.

18 years old. He is the leader of Aurum's Earth Branch and the owner of the White Matter. His level is 0. His ability is Memory Manipulation, and his body is very frail. He is on bad terms with Kwon Jaun and Kang Suhyong. His older brother, Kim Hyunmin, wants him to stop working for Aurum. He does not attend school. He has a strained relationship with Kang Suhyong due to a misunderstanding.