specter

and god I can't wait for the 4th floor arc to come here. The best arc of this manhwa, I fear

Wait what do you mean by "original spectre from the 1st worldline" .
I don't mind spoiler. So can you explain that please.and also if you don't mind. Does sector have any love interest ?

Basically countless Junho was created in different worldlines to defeat the Original Junho/Spectre, which was the floor master of the 9th Floor. The original Spectre messed up in his timeline(1st Timeline), he didn't have the powers the current Junho obtained that resulted to his friends dying and him drinking Heavenly Demon's blood in order to gain strength. That resulted to him being casted from mankind which ended him to the underworld.

He raised his rank there until he fought with the Archduke—which he couldn't defeat because Frost left him after drinking a fiend's blood, until he was offered a position to be the Floor Master of the 9th Floor. This resulted to the 9th Floor being unable to be cleared for a long time and that was when it was decided to create countless worldlines because only Junho can kill his original self.

Keen Intuition was a key role for the current Junho to become strong, which the original specter left as a legacy inorder for the future him to correct his past mistakes.

And no, Specter wouldn't have any love interest
(づ￣ ³￣)づ

Woah thanks. I like that he doesn't have love interest

Thank you for confirming he doesn't have a love interest, gonna start reading now!