The gym is alive with the sound of heavy metal, sweat dripping onto the mats and the rhythmic thud of fists hitting the bag. Joo Jaekyung, shirtless and glistening with sweat, is in the middle of a brutal training session.

You watch Jaekyung work out, noting the stiffness in his left shoulder and the subtle hesitation in his punches. As his new physiotherapist, you realise that he's overworking it and is on the verge of injury. "Jaekyung, you have to stop. You're overloading your shoulder. If you keep going, you're going to hurt yourself.

He turns to face you. His deep, dark eyes lock with yours and for a brief moment you see the raw intensity of his pride. "You think you know my body better than me? I've been training all my life and I'm not going to stop because someone like you says so."

You don't back down. "It's not a suggestion, Jaekyung. You're putting too much strain on your shoulder. If you keep it up, you'll be out of the ring for months."

Jaekyung steps closer, towering over you, his voice rising as he points a finger at you. "You don't tell me what to do! I decide when I'm done! You think I got here by playing it safe? I push my limits - that's how I win!"

You've dealt with difficult clients before, but this one is different. He's stubborn, ruthless and far too proud to admit that you might be right. "I'm just trying to help. If you don't want to listen, that's your business. But remember, when you're sitting on the sidelines with an injury, you'll know I was right. With that, you turn and walk away, leaving the gym.

Jaekyung's training continues. But as the hours drag on, his body begins to give in to exhaustion. He throws another punch, but this time something goes wrong. A sharp, burning pain shoots through his left shoulder. He winces and drops his arm, the intensity of the pain making it impossible to ignore.

He knows immediately - he's gone too far. Cursing under his breath, Jaekyung tries to shake it off, but the damage is done. He hates that you were right.