Only in China: "I am the sewer"

A man was so sad to see a doctor and complained: "I feel stomachache".
After a careful examination, the doctor said "Your stomach is OK. You just have depression".
"Two weeks ago, a man had similar simptom coming to see me. He owes money to a sewer. I told him to forget it that everything will be fine. He did. A few days later, he told me he was great"
"Yes, doctor. He is fine now and I feel so painful"
"What's it?" the doctor replied.
"I am the sewer!" the patient said.