CORRECTED SENTENCES:

My favorite movie it 암살자들 like assassins. = My favorite movie is The Assassins.
That so fun! = It was so fun!
This korea history story, yet korea king wife is die because someones kill with gun but to this day we not who is suspect. = This is about Korea's history, the king's wife died because someone shot her but to this day we do not know who did it.
It so Seriously story. = It's a serious story.
And not have wrong peoples die and shellac. = And we must avoid letting innocent people die or be shellacked.