She always shows up at the same time, sweating it out on the treadmill. It didn't take long for a fleeting glance to begin to mean more than words. Her smile, accompanied by the words, "You're pushing yourself too hard," transformed a simple greeting between gym members into a secret rendezvous via LINE. Contrary to the clean scent of her towels, their relationship grew increasingly intimate. And then, in a sensual hotel, what kind of training...