Who Doesn't Have a Few Ghost Relatives? My Grandfather Is the Ghost Emperor

[Urban, underworld, cultivation, supernatural, multiple female protagonists, school beauty, no system] Spirituality is in decline, ghosts are on the rise! Li Yichen is a college student who relies on working part-time to supplement his living expenses. Until my grandfather, who had been dead for thousands of years, returned and became the Ghost Emperor, and then embarked on the road of ghost cultivation. What's even more outrageous is that in order to force me to continue the family line, I was given fifty years of mana for each additional girlfriend I found. The originally ordinary campus life was overturned overnight. "What? There's someone above you? Isn't this a coincidence? There's someone below me. How about... I ask them to come up and talk to you?" "Can't find the mysterious treasure? I'll go to the underworld to ask the person involved." "Want to be reincarnated into a good family? It's a trivial matter... Who asked us to have people in the underworld?" "Don't mess with me, or I'll let you know what it means that all ghosts obey orders and the Yin soldiers clear the way." "Is death scary? Wrong! If you offend me, death is scary."