Where the Does Disappear

When Sage was twenty years old, her father opened a venison restaurant in the village with a signature dish called blood deer. The villagers are obsessed with the deer, but Sage has never seen one in her home. Her father takes a group of men to the deer farm every night for a "quickie", but Sage is not allowed to enter. What's in the deer farm? Why are blood deer only females? While Sage is exploring the secret of the blood deer, her mother, who has gone mad by accident, suddenly disappears. Sage finds her mother's shoes at the entrance of the deer farm, but her father refuses to allow Sage to enter the deer farm to look for them; Sage finds the deer farm more and more bizarre, and where has her mother disappeared to?