Why did Qiang kill him?

According to the information given, the reason why Hadron wants to kill Xiao Ran may be psychological imbalance. Hadron is a subordinate of Xiao Ran. He helps Xiao Ran to manage the paradise karaoke bars. Because Xiao Ran thought Hadron was cold and calm, he was arranged to secretly observe some customers who might make trouble in the corner of karaoke bars. Xiao Ran trusts Hadron very much. But as for how he killed bare, I don't know. You can also provide more information, so that I can provide you with more specific help.