Can someone tell me why callahan got pissed off of him???? Cause i didnt kinda get it

When? Which chapter?

Hi~ Callahan got angry at Johnny vyz he found out the latter was lying. It seems like Callahan paid someone to investigate Johnny, and the results of the investigation didn't coincide with Johnny's story. In his story, his mother got sick three years ago and stuff happened. But according to investigations, Johnny's mother already died 10 years ago. So Callahan, who was already trusting Johnny bit by bit, was maybe disappointed. He got angry cuz Johnny lied and that somehow proves he's a scammer, in Callahan's PoV anyway.

Hope my explanation helped (●'◡'●)ﾉ

Omg thank youuu that was very helpful (≧∀≦)