Why is Super Weng Zhu a fraudster?

In episode 1, when He Xin and Lao Zhu were deadlocked, a policeman came in with a real liar. At this time, Zhu finally proved his innocence. At this time, he began to scratch and insisted that the people at the police station give themselves a statement. This is a headache for everyone in the police station. Finally, they had to promise to apologize to Lao Zhu and pay compensation.

The reason why Zhu went to prison:

It turned out that Lao Zhu's friend Ma Wei committed a fraud case three years ago. In the end, he absconded, and Lao Zhu himself was arrested by the police as an accessory to the case and imprisoned for three years. In the past three years, old Zhu Meng has done his injustice, but he has nowhere to tell.