Bite to Unlock summary: "Senior, please drink my blood." Hyunseung, who had never been caught as a vampire in his life, is exposed by Taehee, whom he met during a group project. Why did it have to be a vampire otaku who caught him, making it impossible to come up with an excuse?! Taehee, of course, promises to keep it a secret and bombards Hyunseung with questions about vampires. Hyunseung, barely holding onto his sanity, eventually agrees to help with Taehee's fandom... A symbiotic relationship where they share blood and fandom—could this really be okay?