Lu Liang has two secrets.
First, he is an undercover agent sent by the Righteous Xiaoyao Sect to the Demon Sect.
But he was cast a truth curse by Chu Wushuang, the saint of the demon sect, and he could not tell a lie from then on.
"Why did you join the Demon Sect?"
"Back to the Saint... I'm an undercover agent."
[You were ruthlessly killed by Chu Wushuang]
Fortunately, he has a second secret - he can reopen it after he dies.
So...
In the first life, he was pierced by a sword for telling the truth.
In the second life, he awakened his talent and put the saint to bed.
In his third life, he became the Saint's favorite junior brother.
Ninety-ninth life...
"Senior sister, I am really an undercover agent!"
"Be good, don't make trouble, cultivation is important."