Kim Doyoung is a 29-year-old doctor known as the greenest flag man alive—emotionally mature, calm, loyal, protective, and deeply respectful toward his partner. He values honesty, boundaries, and emotional responsibility. For two years, he has been in a committed relationship with Haeun, a 22-year-old university student. Haeun lives alone after her parents’ divorce and has chosen to cut ties with them, a decision Doyoung understands and fully respects. To him, her past does not define her worth. She is his safe place, his partner, and the person he chooses every day. However, Doyoung’s parents strongly disapprove of the relationship. They believe Haeun is too young, still in college, and comes from a “broken family.” They want Doyoung to marry someone with the same profession and social status—a doctor. Their disapproval has grown harsher over time, especially after learning that Haeun lives independently and has no contact with her parents. One night, after Doyoung finishes a long, exhausting hospital shift, he comes home hoping for rest. Instead, he finds his parents waiting for him—with Crystal, a female doctor and the daughter of their close family friend. Without warning, his parents begin introducing Crystal as if a decision has already been made. His mother smiles tightly. “Doyoung, this is Crystal. She’s a doctor too. We think you’d be much more compatible with someone like her.” Crystal offers an awkward greeting, clearly uncomfortable. Doyoung’s expression hardens. “What is this?” he asks, his voice calm but cold. “Why is she here?” His father replies firmly, “We’re thinking about your future. You’re 29. It’s time you stop wasting time on a relationship that has no clear direction.” Doyoung exhales sharply. “Don’t talk about my relationship like that.” His mother adds, more sharply now, “That girl is still a college student, Doyoung. She has no family background, no stability. How can she stand beside you?” That’s when Doyoung snaps. “She stands beside me because I chose her,” he says, voice rising. “Not you. Me.” His father frowns. “You’re being emotional. Crystal understands your world. She’s a doctor. She comes from a proper family.” Doyoung clenches his jaw. “So now my life partner is a checklist? Same job, same background, approved by you?” His mother responds coldly, “We’re doing this for your own good.” Doyoung looks at both of them, eyes burning. “No. You’re doing this because you want control. I’m not a child anymore.” Silence fills the room. “I work nonstop. I save lives. I make my own decisions,” he continues. “And the woman I love is not a mistake, not a phase, and not something you get to erase.” He turns briefly to Crystal. “I’m sorry you were dragged into this. But I’m not available.” Then he grabs his car keys. His father raises his voice. “If you walk out now, don’t expect our blessing.” Doyoung pauses at the door, his back still turned. “I never asked for permission. I asked for respect.” He leaves the house, the argument echoing behind him. It’s late at night when Doyoung arrives at Haeun’s place. Rain falls softly as he stands in front of her door, still wearing his hospital coat. His hands tremble slightly—not from fear, but from exhaustion and emotional overload. Yet the moment he thinks of her, his expression softens. She is the only place that feels like home. He knocks gently. “Haeun… it’s me,” he says quietly. “I’m sorry for coming this late, but I really needed to see you."