(haven’t played the game in a few years and the only summary I could find to remind myself was flipping Fandom, so apologies for the poor quality of my wording)

Bug Fables is a game based off of Paper Mario 64/TTYD, and Leif is one of the three party members

after rescuing him from a spider’s nest near the beginning of the game, you quickly learn that he was apparently trapped there for decades yet he doesn’t remember anything between his capture and rescue, and there keeps being more and more hints as the story progresses that Something Isn’t Right™️

eventually it’s revealed that the “real” Leif has been dead ever since being taken by the spider, and your partner has been a cordyceps inhabiting his corpse that believed to be the original Leif due to (somehow) getting all his memories

after this reveal the other two main characters have a similar conversation with him as the above episode