After seeing Xiaokang and Erdan's frostbite today, An Yinan was mentally prepared.

After she wrote the prescription, she found Yun Shu.

"Send this letter to your leader as quickly as possible." An Yinan said solemnly.

"Yes." Yun Shu carefully placed the letter and quickly left the Northeast Military Region.

In the letter, An Yinan proposed to donate the prescription free of charge. This frostbite ointment can generate economic benefits, but it must be used by ...