Description from kuaikanmanhua:

In a beautiful continent where there is sudden rise of various political movements the situation is unpredictable. A princess of a small country in the south, Dong Chu, who comes from afar travels by herself to the Northern Region to break off her engagement with the North's biggest Feudal Lord, Lin Zhen Ying?! After he was plotted against by his enemies, he suddenly turned into a feeble baby?
Zhen Ying: Woman! Don't randomly pinch my cheeks!
Dong Chu: Gloomy kids can't be naughty! I'll help you return to the throne you lost!
In the end, is this marriage still getting broken or not…?