It's the reason why he has such a complicated relationship with Naerxi. Naerxi is the one who kills him and takes his position. Naerxi, who Yue Tui had trusted completely. And the way Naerxi does it hurts Yue Tui a lot. Naerxi purposely injured himself, so Yue Tui used his blood to heal him. Whenever Yue Tui does that, it weakens him a lot. While Yue Tui was weakened, Naerxi kills him.
As for why he does it, no one really understood. Perhaps it was for the power, as Naerxi is biologically the son of the previous emperor, yet he wasn't given the position. The position of emperor went to Yue Tui, a distant relative, because of how strong he is. But in the end, it was perhaps because Naerxi was sick of seeing Yue Tui controlled by all the elders, and he was sick of his own situation as well, stuck helpless without being able to take control of his own life. After Naerxi kills Yue Tui, one of the first things he does is kill all the elders and completely overthrow how the city was run.
Yue Tui indeed doesn't like being the emperor, and it's hurting him even now in the second season. But he decided that he needed to go back and own up. I don't think he's very happy where he's at right now.
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About Yue Tui's death... This is very spoilerish!
It's the reason why he has such a complicated relationship with Naerxi. Naerxi is the one who kills him and takes his position. Naerxi, who Yue Tui had trusted completely. And the way Naerxi does it hurts Yue Tui a lot. Naerxi purposely injured himself, so Yue Tui used his blood to heal him. Whenever Yue Tui does that, it weakens him a lot. While Yue Tui was weakened, Naerxi kills him.
As for why he does it, no one really understood. Perhaps it was for the power, as Naerxi is biologically the son of the previous emperor, yet he wasn't given the position. The position of emperor went to Yue Tui, a distant relative, because of how strong he is. But in the end, it was perhaps because Naerxi was sick of seeing Yue Tui controlled by all the elders, and he was sick of his own situation as well, stuck helpless without being able to take control of his own life. After Naerxi kills Yue Tui, one of the first things he does is kill all the elders and completely overthrow how the city was run.
Yue Tui indeed doesn't like being the emperor, and it's hurting him even now in the second season. But he decided that he needed to go back and own up. I don't think he's very happy where he's at right now.