There are other characters in here with their own backstories and then there are palace mysteries such as an assassin from 4 years ago, who the mother of ML's son is, etc. When MC first saw the son, he looked nothing like her but was similar to the ML. So she's thinking that the son isn't hers and the ML must have had another bed partner at the same time as being with her. Even though she knew that he was so busy at the time trying to consolidate his power that the only free time he had was at night, which was spent with her. Yet, she carries on this misunderstanding for several chapters. She even dislike the son at first because she was upset that ML was with someone else even though the son was attracted to her the first time he saw her. Later she realized she shouldn't treat him badly because it's not his fault who his mother so she starts treating him better but then when she realized he might actually be her real son maybe also reborn, then she's willing to do anything for him. Even though she didn't have any proof, suddenly she thought he might have been reborn like her and the more she thought so, the more she believed her thinking, which I felt, was a little weird. I get that the author tried to explain her conflicting emotions but it's still a little unsettling that the son liked her from the bottom of his heart when he first saw MC but the MC didn't when she thought he wasn't her son. He's just a 4 year old kid with no mother but she disliked him because she was jealous of his mother at first. I guess it's also human nature but I really can't like those kinds of people.