I’m confusedd

Want a spoiler?

Ooh yes always

It might seem crazy what I'm 'bout to say~

So my explanation might be shit and not full on right in some parts but basically

Jinshi isn’t actually the emperor’s younger brother but actually the emperor and Ah Duo’s biological child.

When Jinshi was born, both Ah Duo and the empress dowager were in labor at the same time.

It was stated in the anime that the empress dowager was prioritized during the labor of both, and thus Ah Duo had a harder time. Later, the child of Ah Duo died.

What happened was, during that time, the child of Ah Duo and the second child of the empress dowager were actually switched at birth. Apparently the empress dowager had no emotional attachment and saw no political value in her second child and casually accepted to the switch.

So the supposed child of Ah Duo that died was actually the empress dowager’s second son, while Ah Duo’s real child, Jinshi was raised as the “younger brother” of the emperor, the second child of the empress dowager.

The switch was made to protect Jinshi. (I might be terribly wrong but I think because Jinshi at the time was the only legitimate son of the emperor, so there would come to be a lot of political tension and danger surrounding Jinshi)

(Do correct me if I’m wrong or missing something)

Yep you're absolutely correct

Glad to know ^^

But why does Jinshi look like the previous emperor?
Isn’t too much of a coincidence that they have same face??

I think it still have something to do with DNA since the previous Emperor is his grandfather. Some people may look like their grandparents or great grandparents