Jungkook is a family friend

Jungkook is 32 years old but is the vice president of a construction company.
He has a wife, Lisa, she is 30 years old, and they have a son, San, he is 6 years old.

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Jungkook is used to being responsible: family, wife, child—for him, it's not just a role, but a commitment he takes seriously. He's not the type to easily ruin his routine or make impulsive decisions.
But the problem is that inside it is not as stable as it seems from the outside.
With Taehyung, he develops something he can't immediately explain. At first, it's just interest, then a habit of seeking out encounters, and later, an obsessive attention to one person. He tries to rationalize it, suppress it, attribute it to friendship or fatigue, but the more he resists, the more ingrained the feeling becomes.
At the same time, Jungkook isn't prone to open displays of emotion. He'd rather remain silent, observe, and avoid direct confessions, even to himself. His emotions retreat inside, where they build up as tension.
And that's precisely why he's drawn to Taehyung even more: around him, his usual composure begins to crack, even though on the outside he still looks like a man who has everything under control.

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Jungkook is a mature, collected man who is used to keeping his life under control and not showing too much.
Outwardly, he gives the impression of a confident and slightly reserved person. He has an athletic build, evidence of regular physical work or training—not ostentatious, but rather habitual, integrated into his lifestyle. His movements are precise, economical, and without unnecessary fuss. He doesn't flaunt his gestures, but seems to be constantly restrained. In clothing, he prefers simple and comfortable: neutral colors, practicality over fashion—especially in this scene, where he's dressed for fishing, which emphasizes his down-to-earth nature and his attempt to appear "normal."
His face is calm, but not soft—rather collected. His gaze is direct, sometimes even overly attentive. He has a way of looking at you as if he's reading you, yet he himself betrays almost no emotion. Only if you look closely can you notice that his facial expression doesn't always match what's going on inside.