I don't know why people would be complaining about your English. There are only a few words that are wrong, but it is still very easy to tell what was intended. I have seen authors who speak English as their first language make the same mistakes.

At the very least, MC knows he's not a good person. The king, on the other hand, pretends to be a righteous and good king while kidnapping and imprisoning people from other planets and using MC's sister as a hostage.