Dan Xiao Wanli

The Crown Prince fell from his horse off a cliff and disappeared without a trace. After losing his memory, he was picked up and secretly hidden away by his younger brother, Prince Ke, right under everyone's noses. Yet this ambitious "good brother" was actually one of the masterminds behind the Crown Prince’s fall. While storms brewed in the court and people lived in fear, within Prince Ke’s residence, passions ran wild night after night. The muddleheaded amnesiac Crown Prince became Prince Ke’s beloved pet — until his memory returned and he finally remembered everything.

(Source: Bilibili, translated)