The actual ending of the novel (im not gonna spoil kdj's actual identity but i'll try my best to summarize it!)
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Kdj was in a state of comatose for how many years because he split his consciousness and the one left behind on earth was only 41%(?) of him and the party members (specifically yoo joonghyuk & han sooyoung) try to revive him by writing their story/adventures and to distribute it to other worldlines where alternate universe kim dokjas exist so he could read it and his consciousness would come back. In the end, with yjh almost dying as well, he managed to distribute the stories to the worldlines and when he came back, it is implied that kdj has finally woken up.
The ending is actually an open-ending and it is up to us readers to complete it. I hope i explained it well LOL
There's a comment that the ending is somewhat a mixed emotions can someone spoil how it ended?