Spoilers
Basically shavonne lost few months' worth memories and totally forgot about Lewellyn and then roamed on the streets as a hobo
Before. This is not his first time meeting Lewellyn. He met him at the jail before where shavonne was an officer and Lewellyn was an inmate(what we saw in the beginning of the chapter). He then totally forgets about Lewellyn and roams on the streets and meets that doctor friend after which he starts working as a ghostwriter.
To be honest, I still can't get over how kanchan abused yumi. I still can't be happy for him >_<