Hmm… I see many people criticize Reigen for scamming and not caring about Mob already…

Well, here’s this detail in the first episode:

The ghost literary said “If you care for that kid at all” The ghost doubted Reigen’s intention to Mob, and as a thank for Mob not killing him, he showed his kindness by warning them. But he didn’t call Mob back by himself, he called out to Reigen.

And what was Reigen’s reply?

He immediately called Mob back.

He experienced the boss ghost’s power (the wind and flying objects) and he worried for Mob’s sake.

HE DOES CARE DEEPLY FOR MOB.