College student Zhang Chu accidentally traveled to the world of demonic ruins in "The Classic of Mountains and Seas" and became a "teacher" in a small border village. In this dangerous place where monsters are rampant and darkness bites people, he relies on modern wisdom and a copy of the "Great Wilderness Sutra" to lead the villagers to survive. When the mysterious "Mountain and Sea Map" awakened in his body, Zhang Chu started the path of upgrading by eating demons, growing step by step from a mortal boy to a legendary figure who stirred up both human and demon clans. There is a scheming scholar, a half-demon gunman, and a violent and cute kid named Little Putao, where passionate battles and machinations are intertwined. This is a story about growth, protection and counterattack, with a tight rhythm and dense excitement.