How did the children who know how to draw in Huanzhugege No.3 Middle School come from?

Yongqi initially refused to accept her. Later, Dong Er, the son of Erkang and Wei Zi, got smallpox, and the bachelor's room was isolated. After Dong Er recovered from his illness, Swallow, Wei Zi, Yongqi and Erkang rode together to the valley for fun. The four of them discussed the present situation there. Erkang thinks it's always wrong to leave painting ice there. If people are short-sighted, it will be bad for the emperor, the queen mother and the family who knows painting. Yongqi was ordered not to neglect Zhihua anyway, so he went to share a room with Zhihua that night. Although Yongqi didn't want to, she felt guilty about Zhihua, so she didn't want to stay in Zhihua's room that night and gave birth to their child.