If ML really said that in his past life I wouldn't be surprised if MC didn't hesitate to assassinated him. At the order of the emperor, correct me if I'm wrong but as far as I remember I don't remember ML said that in the novel. Because I remember he was rumored to be Fboy. So far it's just a rumor although he go out at night it was to hangout at the pub, not to meet anyone. If he said this or showed this attitude it would have been confirmed.