What makes you most depressed in Ningmin Town?

First of all, let's use a picture to understand all the stories in the TV series Ning Min Town. Look at the picture:

All the stories of mountains and seas

I finished chasing this TV series at home during the winter vacation, so good that my friends are basking in it, which shows the fiery degree of this drama. What bothers me most in TV series is Professor Ling Yinong who instructs everyone to grow mushrooms. He brought technology to the local villagers and tried to bring them income. As a result, it was left out by the villagers and even personally attacked. He paid for the farmers out of his own pocket and was even sent to the hospital with the vegetable vendor. Fortunately, it ended well. Professor Ling was moved to tears when he opened the door and saw the villagers!