If You Don't Practice, You'll Be Frozen Stiff

 Another reason Su Ying got these commoners to make charcoal was because charcoal was fast to produce.

 The charcoal that was made was first distributed to the commoners, and the rest was sold. After deducting the wages for the commoners, there was still some money left over. No matter how one looked at it, it was not a money-losing transaction.

 On the third day after the last batch of charcoal was completed, the first snow fell in the capital city.

 Zhou Qing took the cloak and walked to the corridor to put it on Su Ying. "It's cold outside, Your Imperial Highness. Be careful not to catch a cold."

 Recently, Su Ying had been practicing her martial arts skills more diligently, and her hands and feet were very warm. If she put on the cloak, she might start perspiring.