I still can't understand why he's blaming ml for being kidnapped

I don’t think he’s blaming him for the kidnapping it’s more like feeling betrayed that a promise wasn’t kept aka the debt being paid or at least that’s what I understand from it

I think it's about the debt, taejoo said that euihyun didn't have to pay anymore,
and he trusted him, but euihyun still got kidnapped because of the debt, so he's blaming taejoo for making him believe what he said, cmiiw