Wangzi De Wangzi

The self-center Ji Xi transmigrated to another world and became a prince. He thought he could accomplish great things in his kingdom, but his lousy father the king sold him to the prince of another kingdom for 100-kilotons of goods! Prince Ji Xi thought he'd be the hero of a shounen manga, only to end up as a shoujo manga character instead! What kind of isekai adventure story will play out between Ji Xi and that haughty tsundere prince?

(Source: Kuaikan, translated)