I Call You Dad, Do You Dare Answer?

[Two powerful leads, neither saintly nor self-sacrificing + Spirit-medium cultivation + No female lead + Suspense and the supernatural + Two male leads + A series of cases investigating the uncanny]

As a child, Ni Die thought the words written in bold, flowing calligraphy above his family's spirit altar were incredibly badass:

A body full of resentment becomes immortal might,

Even underworld bailiffs dare not give chase.

With the command seal, I can summon a thousand ghost soldiers,

When the King of Sorrow appears, all evil spirits return.

He used to fantasize that one day he could be that impressive too.

But after the King of Sorrow really chose him as a disciple, he discovered...

The road to becoming king is truly paved with countless bones.