Yes, Yiu Hongzi (in the same way pretty much every one of the good guys did) really annoyed me as well - would it have been so hard to even show a bit of warmth to your son? Even before Frankie had turned evil, YHZ was already treating him like trash who was not to be trusted, and as some evil scheming villain carrying a facade of good. This, coming from a man who lent his support to Sima Chungwan at the start and gave him the advice he needed to beat Hong Zhan. It was like, no matter what Frankie ever did, YHZ would never approve of it, and just kept thinking "he's going to turn bad eventually, he's going to turn bad eventually". Why not just kill the kid then? In fact, why not kill both your kids so they wouldn't have to face their fates?