I remember reading a webtoon(?) taking place in an ancient China setting. The female lead I believe has transmigrated (unsure on exactly what) and gets into contact with someone of high status. When she tries to leave his house (while he is out) the guards try to stop her and she uses some power that incapacitate both them and her. She does not remember that she did so when she later wakes up.

Anyone that recognise this story?