Kihyun and Sun-hoo went on a trip before graduation. Unlike Kihyun's plan to spend time alone with his seniors and juniors, Dohyeong, the son of a pension house, intervenes without noticing. Dohyeong, who takes good care of his seniors and juniors, and Sun-hoo, who looks kind to him. Kihyun's jealousy gets fiercer.