At the recommendation of a friend, Soo-ah takes over a one-on-one personal training session and diligently learns how to exercise. However, she can't help but notice the trainer's water bottle constantly pressing against her lower body. "Coach, could you... um, move your water bottle away a little?" "Water bottle?" "...Over there... It feels like something hard is stuck... between... you know..." "Ah... this... it's not a water bottle..."