Cheating money to associate with prostitutes and hating everything is the best motive I can think of. He didn't kill his mother and then commit suicide. When a good boy meets true love, he hates everything arranged by his mother and his superior mother. This is his rebellious period, a serious rebellious period and an inner struggle. He thinks it's all his mother!
He wrapped his mother's body in dozens of layers of plastic, and put activated carbon in every gap to absorb the smell and prevent it from emitting. He installed a monitor in the room, connected to the computer, and could monitor the scene with his mobile phone. If someone enters the room, he can know in time whether his act of killing his mother is exposed.
Originally expected to dismember his mother and bought tools for dismemberment, but he didn't cut off his head and chest, and later gave up dismemberment. What he learned is actually different from what he applied. Disassembling is a bit difficult for him, and he can't see any feelings for his mother's body in the process.
So I'm sure that Wu didn't want to commit suicide at all, just to make the judge sympathize with him and make an excuse for himself. What he has done deserves no one's sympathy. I hope I can tell the truth, let everyone know what he is thinking and teach mothers a lesson. Children who only learn and are not grateful are not born!