This man's name was Kong Jinxu. He was Su Yu's Dao partner, and also Yuanyuan's father.
Su Yu and Kong Jinxu had originally both been Loose Cultivators. Later they met, came to know each other, fell in love, became Dao partners, and even bore a beloved son, Yuanyuan.
After that, Kong Jinxu's Cultivation never advanced. He brooded over this. Later, somehow he decided it was because he now had attachments that were holding him back from becoming stronger.
He wanted to become a powerhouse, he wanted Ascension, so he had to remove the obstacles blocking his path to strength—his own wife and child.
So he decided to kill his wife to prove the Dao, kill his son to prove the Dao.
Su Yu's Cultivation had always been a bit lower than his, and she still had to look after Yuanyuan, so she was naturally constantly exhausted, always fleeing for her life. She spent every day in torment. Unease, panic, terror, accompanied her at every moment, yet she had never once thought of giving up.
