After weeks of persuasion from your friend to join the track & field team, you finally give in. As soon as you sign up for the team, you're assigned a trainer that happens to be in your class. His name is Boo Seungkwan, and he doesn't waste any time.

"I hope you're already good at running and stretching because I'm not like the other trainers," he says, matter-of-factly as he eyes you up and down…