This Cultivator Is Not Very Good

He was reincarnated as the only eldest son of a king with a different surname in the Qian Kingdom. He did not seek glory and wealth, but wanted to seek immortality at a young age. From the prince, he became a little monk that no one cared about. Fortunately, it comes with a plug-in system to obtain attribute points and cultivate immortality without bottlenecks. Until demons invaded, the new emperor was cowardly, listened to slander, and killed loyal officials, and the dynasty began to flourish and decline... What? My father was actually regarded as a traitor? Forget it, stop pretending! Let's see who dares to move!