What kind of feelings does the phrase "I'm worried about charcoal, may it be cold" convey?

Worrying about Charcoal and Hoping for Cold depicts in detail the ambivalence of a charcoal seller who wears thin clothes in cold weather but hopes it will be colder, and expresses the poet's sympathy for the charcoal seller and his hatred for the exploiting class.

Source: Tang Bai Juyi's "Selling Charcoal Weng"

Selected paragraph:

Pity that he is wearing thin clothes, but he is worried that charcoal can't be sold, hoping it will be colder.

At night, it snowed a foot thick outside the city. Early in the morning, the old man drove a charcoal wheel to the market.

Translation:

It's a pity that he only wears thin clothes, but he is worried that charcoal can't be sold, hoping it will be colder. It snowed a foot thick outside the city at night. In the morning, the old man ran over the frozen wheel tracks in a charcoal car and hurried to the market.

Extended data:

The author didn't comment throughout, talking about what kind of suffering the court market brought to the people and how difficult it was for the people to live under such barbaric plunder. But through the story of an old man selling charcoal, suffering, burning charcoal, selling charcoal and robbing charcoal cars, he told people a tragic story that made people cry.

Vividly telling people about the experience of the old people and the suffering brought by the court market makes people understand the reality of class opposition at that time more clearly and deeply, and arouses people's strong feelings of love and hate. This is an artistic effect that the author can't achieve no matter how he discusses it.

Baidu encyclopedia-selling charcoal Weng