My Archenemy, the Straight-A Student, Was Once My Childhood Friend

This summer, the sun shines bright. Xia Yu—the resident delinquent of Xuanwu No. 9 High School, finds himself facing the most disastrous days of his sophomore year. The gentle, kind-hearted "big brother" he once met years ago at a sanatorium, back when he was living as a vampire girl, has suddenly reappeared in his life. "I'm sorry... but I'm actually a guy..." "Even if we can't be lovers, we can still be brothers." "I treated you like a brother, and you actually want to *experiment* on me!?" As the effects of his suppressive medication begin to wane, the 50% of vampire genes still dormant within Xia Yu’s body gradually start to awaken... Being human is no longer an option. Being a guy ...