After Becoming a Background NPC in a Horror Movie

You receive an offer to appear on a simulated-couple variety show. First, you're supposed to film a video about married life with your partner. You wake up at midnight in an unfamiliar bed. A beautiful young man with a cold body lies beside you, his dark eyes fixed on you in the darkness. He grins, revealing a pitch-black mouth, and only then do you realize the video is called: Escape! My Dangerous Lover You're shocked. You: ...W-wait, the director didn't say whether "I" was him or me, did they? And so... An all-seeing gaze fixed on his lover. A diary filled, stroke by stroke, with his lover's name, written in a near-mad frenzy. A girlfriend lying in wait, ready to stab her fickle lover at any moment. Lover: She loves me so much. He lowered his head, his ears turning faintly red. I want you to devour me. I'll write the blurb later. I can't write anymore... Theme: .