The scene of Erkang abstaining from white flour

I would like to ask what is the scene of Erkang giving up white flour? Very painful.

In the story, Erkang accidentally caught white flour, which is a drug. In order to get rid of him, he has been patient and painful.

Erkang is a character in Princess Zhu Huan, which tells a story of true and false princess exchanging identities with five elder brothers, Fu Erkang and Emperor Qianlong.