Oh no

I don't think he would get mad at Byul but more mad at Dojin (that's the husband's name right?) cause Byul knows gma isn't good but he doesn't know why exactly cause no one ever told him but Dojin is secretly funding the gma behind Hye's back cause he still feels some level of obligation to support her cause he thinks that's his MIL but doesn't seem to fully grasp how horrible she was to Hye

Yup, it's Dojin. Ikr, who's not mad at someone who lie behind his back... But, I hope they communicate and no fight