Hidden Coffin Ridge 1

After his grandfather passed away, Zhang Xianyun found a diary from 1953 in his old house. The diary records the strange past of great-great-grandfather Zhang Wenyuan sealing a black coffin into the Xiling forbidden area, and a mysterious man named Zhang Xunlin who carries a sword and lives forever with an unchanging appearance. Three generations of silent guarding point to a secret deep in Xiling that has been sealed for countless years.