A corporate slave dies suddenly at midnight, and is "internally recommended" to become the 38th husband of Su Muya, a 607-year-old yandere vampire—a contract welded to the Third Ring Road, weekly blood supply, daily report precise to the heart rate. Upholding the motto "survive first, slip away later," he battles his way through blood supply negotiations, team-building encounters with the hunter Bai Tao, a predecessor's suicide note, and the cellar ancestor Mo Zhangge. When the Vampire Council forces an audit due to a "contract anomaly," he skillfully spins the life contract as an "industrial injury insurance" and gives a satisfaction rating of 7, neutralizing danger thanks to his wife's partiality. From resistance to the tacit understanding of "who's going to give me my milk tea back," his heart rate gradually stabilizes, and Shen Zhiqiu's prophecy as a "true prisoner" quietly comes true—he might already be the one who doesn't want to leave.