I Slay the Protagonist's Crew by Extending My Lifespan

In his previous life, Shen Ye was both a medical sage and an assassin, saving lives by day and taking them by night. After his identity was exposed, the world's powers hunted him down, and he died pierced by ten thousand arrows.

When he opened his eyes again, he had become the second-generation heir to a modern wealthy family. He had planned to lie flat and enjoy life, but the Mortal World System bound him to it. Succeed at a mission, and he gains lifespan; fail, and his lifespan is immediately deducted. When it reaches zero, he dies on the spot.

The Chosen Ones of Heaven's Mandate are everywhere in this world. When one falls, another steps in. Shen Ye only wanted to stay alive, but time and again he strayed from the script, snatched opportunities, and protected the heroine. He even forced his own life as a villain into becoming the biggest variable in the protagonist's story.