Hello! The webtoon has wonderful art that resembles paintings. A lowly servant with a mysterious past/identity ends up being the Concubine of a emperor who is being controlled by the empress dowagger. There's beasts/snow king that is captured as well. There were alot of plot twisits. The Concubine has one objective and that is to find out her past but the snow king stops her? I'm sorry if this is confusing but I can't find the name and the story is unforgettable,

I found it😭😭 it's called The Queen by TUTU

https://www.mangaupdates.com/series.html?id=147016