AleksandraSucur

There's no doubt "something is rotten in the state of Wu". But the reason why Wu king went personally to war was his relying on wrong people and bad counseling. Before that, he personally demoted NYZ while ZS (prime minister) entrusted Liudao Hall to his nephew who destroyed all the intelligence kept in the headquarters. Does he need betrayals, especially from people who are entrusted with his security? It is the Wu king who betrayed loyal people around him and continues in doing the same mistake when refusing to put the truth of their heroism in writing.
Besides, all top power relations/ power people in Wu are rotten on their own, and we see the similar situation in An, too.

Yup

It's normal to be tired, in real life, none of US would stand such a freak. The issue I wanted to raise up is different: what options such an abondened child had in his life? It's nobody's fault, Ruyi could have not played all the roles. Imho, he truly misses a father figure

LTG is a shakesperean (or dostoevskijan) character. No "normal" person "was there or done that". We, "the normals" don't share their pain, ie. the intrinsic tragedy of their existance. The empress tasked Ruyi (then also in her teens) with "mission impossible": teach him martial arts and how to be a man. Ruyi took upon herself the first part of that order, the second was out of her reach, she might have been a (missing) motherly figure, but no way she could have been a substitute for a figure of father (she also didn't have, her father actually sold her).
Wether LTG is redeemable or not depends on the scriptwriter: either case will be understandable. If freudian "father figure" jumps in, teaching him a lesson or two (your "mother" is "my woman") he will. If not, it's also fine, we've got a new tragic character