From the Start, I Inherited a Hidden Immortal Formation

The day Lin Yuan rented his apartment, he received a jade pendant left behind by his grandfather, who had been missing for thirty years. The pendant grows hot. Thirty-seven account books are filled to the brim. On the last page, one line reads: Take my place and guard our home. A great formation lies buried beneath Jiangcheng. His grandfather guarded it for thirty years. Now it's Lin Yuan's turn. The immortals aren't in the mountains; they keep watch amid the sea of people. The Hidden Immortal does not hide. The guardian makes a home.