
it is OG Reeze. and Cliff did realize she wasnt the Reeze(author) he was looking for when he went looking for her in the prison.
from what was seen in previous chapters he "left" the world via the system to look for his Reeze(author) just like how OG Edith left her world after the constraints were gone

Am I imagining things?? Cause I swear that’s literally what happened already in the previous chapters, hence why he’s missing lmao. He met the OG lize, realized it isn’t the girl he actually likes, got upset, saw the system giving him a chance to leave the world and search for the author lize, and that’s why he disappears and why the duke is giving the position to killian.
I know alot of ppl have been giving novel spoilers, and i'm glad the manhwa is diff cos it feels like i'd reading a diff story.
I'm hoping this is OG Reeze. And that Cliff had dropped by before Edith did. Cliff realised Reeze isnt the vindictive author he fell in love with, so he goes ard searching for her aimlessly like a madman and dies.