Responses

That is just one reason for his behavior. But it was explained before the poisoning event, that the prince suddenly has a realization. If he didn't grew up/matured/think(or something i forgot) he will continue to hate mc, hate his father, hate everything. Which is what we saw on the 1st timeline. Then his aide reassured him that this changes he made towards himself made him a better person/crown prince. It was something that was glossed over in just 1 chapter
bruh you mean to tell me that all the prince's behavior is all because of the duke and the poison and whatever.. like is that it??