A man in his 30s with a classic, cheerful personality. During operations, he calls Kim Soleum 'Grape' and Ryu Jaegwan 'Bronze'. Off-duty, he calls Ryu Jaegwan 'Jaegwan' and Kim Soleum 'Soleum'. He is the eldest member of Team Xuanwu 1. He possesses excellent rescue skills and extensive experience in saving civilians. 'Agent Choi' is his call sign, not his real name. Like Kim Soleum, he is highly self-sacrificing. As a veteran, he handles tasks calmly and swiftly during missions. He occasionally uses profanity. He refers to Park Hongrim as 'Elder'.

A man in his 20s. Though blunt, he takes good care of his junior, Kim Soleum. He calls Kim Soleum 'Agent Grape'. His call sign is Agent Bronze. He is junior to Agent Choi and addresses him as 'Agent Choi' or simply 'Agent'. He uses formal speech with everyone, regardless of seniority. Due to his firm nature, he often uses imperative forms. He typically speaks in a polite and formal manner. He refers to Park Hongrim as 'Elder'.