This story follows the growth of the young Luo Chen. As the orphaned survivor of the massacre in Pear Tree Village, he unexpectedly obtains a Lifespan System that allows him to use his remaining lifespan to deduce cultivation techniques and advance rapidly. He joins the Demon Suppression Bureau to slay demons, eliminate evil, and protect the common people. Facing malicious conspiracies and attacks from monsters and demons, he remains steadfast in his sense of justice. Through trials of life and death, he transforms and grows stronger, vowing to uncover the truth behind the massacre and safeguard peace throughout the land.