Reasoning in court: The风流Painter

"How much you want, I'll pay. I just hope you can secretly investigate whether there is any problem with my wife's private life." Mr. Wu Zhishun was pleading behind me, swaying his obese body. Due to economic difficulties and debts pressing on me, I had no intention to investigate this affair.

"Do you have a suspect?"

"Yes, an artist named Tang Zhen Shan!" he answered.

"If you already have a suspect, why do you need me to investigate?"

"Because there is no evidence!" He slammed his fist on my desk hard.

I had no choice but to agree.

He immediately pulled out a photo from his pocket. It was of an extremely beautiful woman. He said shyly: "This is my wife."

"Oh, she's very pretty!" I replied. This was a typical case of an older husband and younger wife.

"I am usually busy with work. She said she wanted to learn painting, so I sent her to study under Tang Zhen Shan!"

"Isn't Tang Zhen Shan where he is today because of my help? And yet she turns around and forgets our kindness!" He said angrily.

"Has your wife mentioned anything to you?"

"No, she hasn't said anything, that's why I need proof."

"Where does she learn painting?"

"De Hao Building on Zhongxiao East Road, my wife is definitely there."

Afterward, I conducted a thorough investigation into Tang Zhen Shan. It turned out that his painting skills were quite high, and he was still unmarried. His flirtatious nature won the hearts of many women, which also made him some enemies.

When he was out, I sneaked into his apartment and carefully installed a listening device. Fortunately, the neighboring room was unoccupied, so I rented it to facilitate eavesdropping. All these expenses were covered by Mr. Wu.

Through the eavesdropping, I learned that someone named Song Zheping frequently clashed with him over an award, almost leading to a violent incident. These conversations were all recorded.

The dialogues between Tang Zhen Shan and Jiang Xiaoting, I listened to even more carefully. They indeed had an intimate relationship. However, Tang Zhen Shan did not truly love her. I only played the recording for Mr. Wu to hear, and he became enraged. I was really worried about what foolish things he might do!

A month later, what I feared happened: Tang Zhen Shan was stabbed to death at night. Unfortunately, I forgot to turn on my recorder, so no clues were captured.

Detective Zhang Jichuan believed that whoever could enter the house must be familiar with Tang Zhen Shan, so Mr. Wu, Mrs. Jiang, and Song Zheping were all suspects. Moreover, a lighter belonging to Mr. Wu was found next to the corpse, so Detective Zhang was convinced that Mr. Wu was the murderer!

"It's not him!" I protested against Detective Zhang who was overly confident!

"You even forgot to turn on your recorder, how do you know it wasn't him?" Detective Zhang mocked me.

"In any case, I already know who the real murderer is!" As a private detective, I've always thought I'm as good as them, so I refused to lose.

Dear friends, can you guess who it is?

Answer