Ning Qiuyan volunteered for a medical project, serving as a human blood bag for a certain individual suffering from a blood disorder.Guan Heng, the legendary mysterious billionaire, is very low-key and reclusive. One of his photos leaked, and he secretly became popular online due to his long hair and delicate, handsome appearance.Ning Qiuyan found out:Guan Heng never shows himself in the daylight, the curtains at his home are always drawn, and they always meet at night.Guan Heng is pale-skinned, has a cold and eccentric personality, and every time before Ning Qiuyan donates blood, he has to fast and bathe.That house is cold and dark, never seeing sunlight.Guan Heng’s heart beats slowly, and his body temperature is cold.After falling asleep for the first time during the blood donation process, Ning Qiuyan woke up to find a bite mark on his neck.And he inexplicably feels an uncontrollable desire to submit to Guan Heng.