Hello

There was this manga I've read few years ago but I don't remember its name and I can't find it...
Please help me.

The story take place in a feudal japan-like country.

A tiny commoner girl (looks like a kid) who's actually a young adult become friend with the prince (or young lord) and he fall in love with her.

....

I remember at the end of the manga she's taken as a political hostage and After a time skip we find out she became a taller and beautiful woman...

Thanks for your help.

I'm reasonably certain you're thinking of Mikado no Shihou.

Mikado no Shihou

~4400 manga completed
~1700 ongoing...

Quote from Epsilance

feudal japan-like country.

(story is set in ancient china) 🤣 not the first time. beats being a koreaboo who thinks qixiong ruqun remotely resembles any style of hanbok.