His wife got raped and killed and his three years old son murdered in front of him by Xiao Nanfeng.
He wanted revenge so he used a forbidden skill to transform himself in Combat Hawk and gain power. Using that skill, his cultivation increased to the 1st/2nd Demon King Stage (Combat King) but in exchange, he only had 4 more years to live
In the end, he couldn't get revenge himself and get killed by Xiao Nanfeng. Later Jiang Chen will take revenge for him.
