Lu Chen: A former overseas special operations agent who retired after suffering severe injuries. He seems lazy and quick-witted, and dislikes drawing attention to himself. Beneath the surface, he carries the crushing guilt of having lost his comrades, and keeps his promises above all else. He only steps in when forced, hates pointless killing, and hides the scars of war. His greatest inner conflict is that he wants to protect Xu Qingyan, yet fears dragging her into the dark whirlpool of his past. He wants to uncover the truth, but every step forward awakens buried nightmares.
Xu Qingyan: CEO of Qingyan Group, 26 years old. She took over the company in a crisis after her older brother, Xu Zheng, died. Rational and resilient, she is also sensitive. Trust comes slowly, tangled with gratitude, wariness, concern, and wavering doubts. She has strong business acumen, but she can grow tired and break down before getting back on her feet. She is no damsel in distress: she learns to recognize conspiracies and gradually understand the rules of the underworld, without ever abandoning her principles.
Xu Lele: Xu Qingyan's younger sister, a 17-year-old high school student. Lively by nature and pure-hearted, she is the story's gentle mirror. As danger draws ever closer, she goes from being innocently curious and enjoying playful banter with Lu Chen to experiencing fear and being forced to grow up.