I Have the Alchemy Emperor in My Head - Chapter 2510 - : Chu Yunfan Appears, Slaying the Demons’ Half-Emperors

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

This is a story of an ordinary boy gaining unusual powers from his nightmares… It all started when Lin Sheng experienced something strange on what he thought was just another normal day. He begins to have recurring dreams that lead him on an incredible journey of discovery as he encounters spine-chilling monsters and elusive secrets.

Seojin transmigrated into the novel named ‘777: The Crowned Sovereign’ as Seven, a side character.Here, he was the seventh child of the seventh archduke of the seventh kingdom of the seventh continent.On Earth, he was raised by his seventh stepfather and the child of the seventh ex-wife of the seventh mayor. He even had his seventh maid quit the job.He was also the seventh reader of the novel he transmigrated into.[Welcome, Seventh Reader! Your loyalty has been awarded.]With this many sevens, will he curse it as an unlucky number or… praise it seventy seven times?…Note: The author is a complete newbie and this is the seventh draft. Please don't expect this as such a grand story.Thanks. Merci. Danke. Bedankt. Terima kasih. Gracias. Salamat.Congrats! You just learned how to say ‘thanks’ in seven languages! ;P