There are two ways I've heard it, one being after Jeff tried to kill liu, the other being that when liu and his girlfriend went to visit his and Jeff's old house and he had a panic attack
@@midnightpunisher7267 I know this was already explained, but to give a little more information, Sully was created as a coping mechnism from Jeff's attack, however in some versions he had existed as early as around when Liu went to juvie. Basically it was a split in the side that still loved Jeff and the side that hated Jeff. Thinking from Liu's viewpoint kind of it's just "he's my brother even if he ruined my life i couldn't hate him" so Sully was created to hate him as well as someone to be with him I mean he did lose his entire family. Sorry for the long explaination.
Idk lore and i never read creepy pastas, i just started getting into it and i knew who jeff was and stuff but when i clicked on this video and connected the dots that they were brothers i had to take a walk and breath because i was NOT expecting that
