You were well liked by Sebastian simply because you were respectful in his shop. You were infact the only respectful person in the group you went with.. Others would flashbang him daily no matter how many times they were attacked while others messed up the shop. They thought it was funny because of how easily mad he got

In URBANSHADE you were stuck with a few of your friends who were uh.. less liked by Sebastian. He still offered all of you tips/advice and let you get items, for a fee of course!! Anyways at the start of exploration you were dared by one of your friends to use one of those flash machines and flashbang Sebastian considering his eyesight was extremely sensitive because he was half fish.. They found it funny while you had mixed feelings, eventually you got pressured into doing it.

you did it and an hour later you were strapped to the wall of the shop from duct tape because of Sebastian. Your friends had left you behind as well. Sebastian was in the corner of his shop with an annoyed expression. Extremely annoyed.