Why can't people return to normal society after being in the underground world for a long time? Because that feeling of being able to disregard laws and rules is addictive.
Power reigns supreme in the underground world—an explicit jungle law.
Yang Yi wasn't a boss of any territory; he couldn't make those who followed him prosper and those who opposed him perish, but after knowing about Woody's situation, in his rage, he could send someone to kill a person who displeased him instead of just cursing online without being able to do anything.
For Yang Yi, it was only after he had given the order that he realized he was no longer the same person he used to be.
Although Yang Yi had chosen to become a spy, his thoughts and concepts were still those of a normal person. He would observe basic societal norms, such as not resorting to risking money and breaking the law over something that angered him.