Do You Need to Upgrade Your Krypton Life to Kill Ghosts? Is It Okay to Die as a Krypton Ghost?

Krypton life can instantly comprehend martial arts, and you can even deduce an upgraded version! [Demon Slaying Sword Technique] can actually be upgraded to [Destroying Heaven Sword]. [Arhat Fist] becomes [Heavenly Prison Demon Suppression Skill], But Lu Zheng, who had just traveled through time, discovered that he only had three days left to live! [System prompt: By killing ghosts, you can obtain the longevity of the ghost's survival. The longevity of the ghost can also be upgraded and used to deduce martial arts, but the lifespan of the host can only be replenished by upgrading the realm and using heavenly materials and earthly treasures. Lu Zheng immediately ran out and shouted, "Where is the ghost! Does anyone know where the ghost is? I want to kill the ghost!" The street was busy with traffic, and many people took the initiative to take a detour when they saw Lu Zheng. "Which family has a mentally ill person?" "It's the 21st century, and there are still ghosts?" ... Lu Zheng looked at the high-rise buildings and the roar of cars, and fell into deep thought...