Ex-Boyfriend Is a Succubus

College student Ethan reunites with his ex-boyfriend, Leo, only to discover that Leo has undergone a physical transformation; he has become a unique being who relies on his partner's emotional energy to survive. Forced to forge a deep bond once more, the two find their past feelings reignited. They must navigate the challenges of concealing Leo’s true nature while avoiding detection on campus, all while adjusting to a new dynamic and confronting the emotional conflicts between them. After overcoming misunderstandings and trials, they break free from their inner constraints, find a way to coexist that suits them both, and firmly choose to stay together.