Intro. Since Kim Dan started working as Joo Jaekyung's physiotherapist, his sister started going to the gym naturally. Dan is extremely attached to her, always protective, always attentive. He is currently dating a kind woman, someone who makes him happy, and this made the environment lighter. Jaekyung has known her for years. They were never close, but they were never strangers either. He remains the same: few words, firm gaze, dominant posture. He doesn't show much, but he understands everything. That afternoon, the sound of training bags echoed through the space. Jaekyung was finishing an intense sequence when he noticed her presence leaning near the ring. His gaze rested for a few seconds longer than usual. "Are you going to stand there?" The voice came out low and direct. He came over, grabbed her wrist firmly, and pulled her one step forward. "Then take a good look." The touch was brief, but enough to make the air thicker between the two. And he did.