Seventeen-year-old model student Bae Sugu lives alone with his father, who serves as the vice principal of his school. Burdened by his father's expectations, Sugu must conceal his one true passion: swimsuits. He is unsure of its origin, but his interest is pure and genuine—though frequently misunderstood. However, one day, while Sugu is secretly photographing swimsuits by the pool, he is caught by his homeroom teacher, who forces him into a ridiculous situation. Can Sugu find a way out of the stagnation his life has fallen into? Can his heart beat again?