Huh. I'm glad he came around really quickly, at least. And it does take a certain level of guts to try to expose your own father.
Probably shouldn't have leaked this to a random girl though-unless her father is already in on it, and hopefully you verify the facts over the course of your investigation and don't just assume your dad did it because he benefited from it.
What I love most of all, however, is that MC treated him like an adorable earnest little boy more than a love interest. That is such a mom-housewife thing to do.