The ability "Substitute upon Death," to date, has only triggered once for Le Yu.
After all, the activation conditions for this skill are quite stringent. There is great fear between life and death. The first time, Le Yu successfully crossed over from his body to that of Qian Yuliu, but what about the next time? Will the skill fail to activate? Are there other hidden requirements? Are there any side effects? Is there a limit to the number of uses?
Since the activation condition is death, Le Yu doesn't dare to test it casually. As a normal human, his basic instinct is survival, so why would he voluntarily seek death? This skill itself is against human nature.
Moreover, "Substitute upon Death" clearly states that Le Yu can only cross over into the body of the killer. Without other examples, Le Yu can only trust the skill description.
This means that if there's no killer, or in cases of suicide, illness, or old age, Le Yu would truly die.
