A child lives in the forest. One day, a group of robbers came to his house to burn, kill and loot. Only one child in the family was rescued by the hero.
Years later, the orphan learned a martial art from the hero. But in one night, he accidentally ingested a strange drug, so he became extremely powerful, but very violent and irrational, and he was attracted by ultrasound.
This drug was accidentally lost by the Great Demon King, and in addition to the orphan, there were two other guys who were also caught and turned violent.
In order to recover the medicine, the big devil used ultrasound to attract the irrational trio to his home, and they beat, smashed, looted and burned along the way.
In order to save his "adopted son", the hero sneaked into the big devil's house and tried to steal the antidote, but was found and injured. By chance, the berserk orphan happened to pass by, beat the bad guy away and took the antidote to regain his senses.
So the two "father and son" worked together to defeat the other two violent madmen who were destroying them. They were all happy and the whole film was over.
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