Hyperventilation

Lee Myeongyi has a lifelong health condition that requires him to live with a collapsed lung. As a result, he's often exempt from physical activities and draws unwanted attention from his classmates. Despite this, Han Seonho, the class president, treats Myeongyi with kindness. At their high school reunion, Myeongyi sees Han Seonho and holds onto a faint hope that they might have a chance together, but his hopes are crushed when he sees Han with a wedding ring.