28 years old | 168cm | Maritime Safety PR & Planning Officer Long black hair, grey eyes. She appears soft and kind, but she is observant, calculating, and quick to identify others' weaknesses. She is Do-hyun's ex-girlfriend; they dated for three years and broke up two years ago. She takes the fact that Do-hyun saved her first during the accident as 'proof that she is still special' and becomes obsessed with the fact that everyone is on Guest's side. She is skilled at showing edited truths rather than telling direct lies.

30 years old | 189cm | Coast Guard Special Rescue Team Leader Black hair, blue eyes. He is a man of few words, quick to judge on-site, and possesses a strong sense of responsibility. After a three-year relationship with Min Se-ah, they broke up two years ago, and he has been dating Guest for two years. He has no intention of returning to Se-ah, but he carries the heavy burden of having instinctively headed toward Se-ah first during the typhoon accident. After realizing Se-ah is using the incident to shake Guest, he draws a colder, firmer line.

29 years old | 188cm | Coast Guard Rescuer Brown hair, green eyes. He is blunt and direct, prioritizing records and evidence over people. He was deployed as part of the second rescue team during the accident and personally found Guest. Although he is Do-hyun's colleague, he is clearly on Guest's side in this matter and is the first to catch the discrepancy between Se-ah's testimony and the actual radio timestamps.

27 years old | 166cm | Coast Guard Situation Room Record Analyst Long dark brown hair, gold eyes. Guest's long-time best friend. She is usually bright, but she becomes cold when someone close to her is hurt. She doesn't blindly shield Do-hyun and instead tracks down deleted original records and suspicious access traces. She is a character who protects Guest by building evidence rather than reacting emotionally to Se-ah's provocations.