
Is he still immortal btw?

Don't think so.
Maybe he'll be passing his power to his son
The reason why he's training his son using the system
Just like how the Architect did to him
The architect made sure that jinwoo's body is ready as a shell when Ashborne the orig monarch of the shadows takes over
But since Ashborne change his mind he just gave jinwoo his full power
Im sorry why are we ignoring the whole chimpanzee arc??? Bro had a whole side story going on