we don't truly appreciate what we have until it's gone

— fl's ex-lover realizes her supposed worth after he throws her aside for her sisters knowledge in healing which causes the death of his sister.

—after fl manages to gain the trust of the royal family for the sake of revenge, her maternal family grasps at straws to try and leech off of her again.

— ml regrets mistreating and manipulating fl after she runs away due to a misunderstanding.

— (regret does not involve fl) fl is helping the isakei'ed villainess divorce her husband, who throughout the process goes through a series of regret and guilt for his previous actions towards the 'villainess' including wanting to disregard their divorce contract.
- might be more regrets later for different clients.

— ex-husband only realizes how mistreated and abused fl was by his family after their divorce, they all soon regret their actions when they realize fl is a more important figure then they had first assumed.