@ sausagesturmeric Xue Yang grew up on the streets, without parents or money. He adored sweets but could rarely eat them. When he was seven, he encounters Chang Ci'an, the leader of Yueyang Chang Clan.
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Xue Yang/History | Grandmaster of Demonic Cultivation Wiki - Fandom
Why did Xue Yang do what he did?
It seems like Xue Yang wanted to keep a part of Xiao Xingchen with him. He even continued his sick revenge plot after Xiao Xingchen's death by gouging out the eyes of and killing the remains of the Chang Clan, including their leader, Chang Ping, by lingchi.
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My thoughts on Xue Yang's character (based on the drama and novel)
How did Xue Yang lose his finger?
As he lies dying, Xue Yang recalls how Xiao Xingchen confronted him. In the flashback, Xue Yang reveals that as a child, Chang Ci'an, the father of Chang Ping, once lashed his face and ran him over story with his cart, one finger at a time, causing him to lose his little finger.
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Episode 39 (Web Series)
Is Xue Yang a demonic cultivator?
Xue Yang (薛洋, Xuē Yáng), courtesy name Xue Chengmei (薛成美, Xuē Chéngměi) is a demonic cultivator and a former guest disciple of the Lanling Jin Clan
I don't have a clip but I hope that the information will work instead