Different Roads for Humans and Ghosts

(Inspired by Mysterious Resurrection: the bizarre cannot be killed, they follow rules for killing, and the protagonist is decisive and ruthless. He starts by learning the rules, then grows stronger. No mindless plot, no power fantasy, and no System.)

There's a forbidden folk ritual passed down since ancient times: rice divination. A practitioner places a bowl of white rice on a table and sticks two chopsticks upright in it, inviting a deceased person's relative to possess them and speak with the living. Few people know that this is no mere legend...