Era of Castles: Starting with 99 Dragon Eggs - Chapter 43 - Monsters Attack! Undead Creatures!

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

Being young is a treasure, but education is indispensable.For Han Yu, who started working at sixteen, being too young wasn't a good thing.Due to his young age, he was almost turned away by the leaders when assigned to a bureau.Witness the story of the youngest police officer in the history of the Linghai Public Security Bureau turning his life around.

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.

Crippled by the loneliness of life and now the sudden death of the only person that treated her as a human. With strong feelings, Megumi scorn's life end abruptly as she wished to re-join her friend Eric, in death... Only.... She wakes up in the same room feeling an eerie change to her surroundings.Behind her stands a Reaper! Revealing her death to be true, she now finds herself separated from Eric in the world of Purgatory. A world of death where demons are born, the reapers sow and the sins of man become alive!