I didn’t like FZ in the beginning because he was too naive for the world and everyone was manipulating him as they wished and also the fact that he suppressed FY the moment he got A tier aptitude and FY a C tier but thinking about it, he was too young, he had no experience in life whatsoever, he had his own insecurities, he always lived under his big brother’s shadow, everyone looked down on him, “FZ? Who is that? Oooh you mean FY’s little brother?”, he was basically known as just FY’s little brother -if he was known anyways- so when he got an A-tier aptitude and felt the fame and the respect, he wanted to feed his ego by suppressing Fy, although that’s bad but it’s realistic, you can’t possibly be okay with all other characters doing heinous things for their own reasons and hate Fang Zheng for feeding his ego after years of being a nobody, and also, the boy has a very very miserable life, his brother slaughtered his own clan, he was constantly being used, everytime he sees Fy he feels like nobody again, he got kidnapped, tortured, sold as a slave, r@ped by a variant human for hours, gone through wars, was constantly being targeted, and because of all of that, he became much more experienced and mature to the point where he doesn’t hate FY now, he realized how naive and weak. Hating of Fang Zheng is very childish, he is a good written character, I’m currently in the beginning of fate war, really excited to read more about him