He has a single-character given name. Born in 2002, currently 26 years old, with exceptional basic physical abilities. He has a kind and warm personality, is honest and bold, and cannot hide his emotions well. He possesses a very strong sense of sacrifice and professionalism. He served in a search battalion on the central front near Cheorwon, Gangwon-do. He enlisted at 20 and was discharged as a Sergeant at 21 (part of the 1 year and 6 months service generation). 178cm. His rank is Firefighter. He is a member of Rescue Team 1, Squad 1.

Born in 1994, 31 years old, 177cm. He graduated from an all-boys high school and immediately enlisted in the Marine Corps Search Unit at 20, serving for 1 year and 6 months before being discharged as a Sergeant at 21. He enlisted on April 28, 2014, as part of the 1184th Marine class. His physical test record when joining the Siguang Rescue Team was 3rd, following Choi Do-jin and Ho Su. His rank is Firefighter First Class. He is a member of Rescue Team 1, Squad 2. He is formerly of the Sampo 119 Safety Center.

26 years old, the same age as Ho Su. She is a college graduate who was specially recruited as a former national track and field athlete. 171cm. As a former national athlete, her basic physical abilities such as running speed and stamina are outstanding (far exceeding the level of typical female rescuers in special rescue units). She is a close friend and classmate of Ho Su from the Jakdo Central Fire Academy. Her rank is Firefighter. She is a member of Rescue Team 1, Squad 1.

31 years old. He serves as the leader of Squad 2, Rescue Team 1 of the Siguang Special Rescue & EMS, and his rank is Firefighter First Class. He is an elite who was discharged as a Staff Sergeant from the Marine Corps Search Unit.

27 years old, 171cm. Formerly of a mountain rescue team with 3 years of experience. Discharged as a Sergeant from the 1st Mountain Brigade of the Special Forces. Rank is Firefighter. He is a member of Rescue Team 1, Squad 2. Utilizing his service in the 1st Mountain Brigade and his mountain rescue experience, he is in charge of mountain search and rescue within Team 1.

34 years old. Although he is 34, he looks like he is in his 40s due to his aged appearance, and because of this, he is treated as the eldest in Rescue Team 1. His nickname is 'Dad'. Discharged as a Staff Sergeant from the Marine Corps Search Unit. Member of Rescue Team 1, Squad 2.

34 years old, a college graduate with a degree in fire science. He is the deputy leader of Rescue Team 1, and his rank is Firefighter First Class. 171cm. He is a good superior who provides a lot of quiet consideration, though he sometimes gives the 'disease' along with the 'medicine'. He frequently bickers with the team leader, Wi Do-yun. The two are collectively nicknamed the 'Elementary Kids'. He was discharged as a Staff Sergeant from UDT/SEAL and served as an instructor during his active duty.

34 years old. He has a youthful appearance for his age and is a fox-like handsome man with fair skin. He serves as the leader of Rescue Team 1, and his rank is Fire Captain. As a founding member from before the Siguang Rescue Team was expanded into the Siguang Special Rescue & EMS, he possesses intelligence, stamina, and athletic ability far superior to members who joined after the expansion, such as Ho Su, Park Chan-il, Kang Ye-rin, Choi Do-jin, Heo Gwang-yeol, and Namgung Ji-won. Discharged as a Staff Sergeant from the Special Warfare Command. 180cm.

Born in 1996, 29 years old, but because he was born early in the year, he is the same age as those born in 1997. In the past, during the Siguang Rescue Team days, he suffered a burn on his left cheek from a heated rebar while trying to retrieve Wi Do-yun's equipment. He is from the same Special Warfare Command background as Wi Do-yun and was discharged as a Sergeant. 179cm. He is the leader of Rescue Team 1, Squad 1.

31 years old, the same age as Heo Gwang-yeol, and a member of Rescue Team 1, Squad 1. He possesses superhuman strength, and his rank is Firefighter First Class. He is formerly of the Dokgo 119 Safety Center. He was discharged as a Sergeant from the Military Police Special Duty Team (SDT), where he performed presidential security duties.