Jorgen: Yes... I remember!... I was an adventurer, travelling the world to find my fortune. Once, when treasure hunting in a cavern, I came across a mysterious insect. I fought it, thinking it was just another bug, Boy, was I wrong... It was a parasite, feeding off of memories. So it ate mine... and you know the rest.
You can talk to Jorgen in Cafe Moondust after being hired to obtain his Parameter Bonus. He will be standing on the second floor to the right of the stairs.