Lazing Around at the Demon-Slaying Bureau, How Did I Become Invincible?

[Lighthearted and fun + steady power progression + decisive and ruthless] This is a world where spiritual qi has revived, everyone cultivates immortality, and humans and demons live side by side. Su Yang, who transmigrated here, has a System that lets him see monsters' health bars. Then he discovers that as long as a monster dares to show its health bar, there's nothing he can't kill...