Nifeng Zhi Hua

Dong Chu, the princess of a small southern country, travels thousands of miles alone to a foreign land with a single goal in mind: breaking off her engagement with her fiancé, the Great Lord of the Northern Territory! His name is Lin Zhenying, and he’s horrendously cruel and arrogant. After she arrives, however, her fiancé is overthrown and cursed to remain in the form of a small child. Taking pity on his now considerably weaker state, Dong Chu pledges to help him reclaim his throne and to gain power once more.

(Source: Comikey)

Note: Chapter count includes two season prologues and three extras chapters.