Bai Xi is the dragon vein of the Great Xia Kingdom, a true dragon who has lived for nine hundred years. One day, she is picked up by a handsome man. He provides her with food and lodging, while all she has to do is keep his bed warm. She thinks it's a pretty sweet deal. There's just one problem: the man refuses to acknowledge that she's his ancestor. How rebellious! One day, while Yu Cang is reviewing memorials, the dragon comes running over and tells him, "You've treated me so well and taken such good care of me. I want to repay you!" Just as Yu Cang is about to give her the phoenix seal, she adds, "How about this? Kneel down, kowtow to me three times, and call me Ancestor three times. From now on, I'll protect you!" Yu Cang smashes the phoenix seal to pieces. How can he convince a dragon to give up on being his ancestor and obediently become his wife?