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Kim Dokja had the chance to give himself a happy ending to his story. At the beginning of ORV, there would've been no happier ending to his life than being alone reading TWSA without any bodily needs or any responsibilities forever. The end of ORV was a book ending for Kim Dokja's character arc.
But he didn't take it. He didn't take it because he loved his companions too much. In the 9th scenario, Kim Dokja referred to love as being the farthest thing from him. By the 99th scenario, he's been so loved and he's loved in return. And so, that love corrupted his ending. His perfect ending was no longer perfect because of the 50% of him that had been irrevocably changed from his time in the scenarios.
It was that 50% he just needed to cut out of himself. He was quite literally half a man before he became Kim Dokja of Omniscient Reader's Viewpoint. If he had simply cut out that part of him and gave that to his companions, he could've returned to who he was at the start of the scenarios. He could've been happy and content with being the Oldest Dream. And eventually, he would have been found and picked up Secretive Plotter and the 999 crew. We know this, because we saw it.
But he didn't do this. Kim Dokja could not let go. To properly be the Oldest Dream, he had to only love one particular story. But Kim Dokja had more to love than just one story. He loved so many more stories. He loved THEIR story where he had existed with them. And, selfishly, Kim Dokja held onto a little bit more because he did not want to forget his companions. He didn't want to forget his friends, his children, his relationship with his mother, his adoptive parents, and the life they'd had.
And in doing so, he unintentionally created ripples in the happy ending. He poked a hole in that story. Because 49% was not 50%. 2% of a difference meant that the Kim Dokja that the others kept was never going to survive, as he was still an avatar and could not live without Star Stream. And Kim Dokja in the train could not be content in his isolation because he longed for those he could no longer see even as he denied himself his own omniscient powers to look in on them whenever he wanted.
The Fourth Wall berated Han Sooyoung and Yoo Joonghyuk for ruining the ending of the story, but that wasn't entirely true. It was, as everything was, Kim Dokja's fault in the end.
Omniscient Reader's Viewpoint's greatest tragedy is that Kim Dokja was loved. Because without that love, he could've been the ideal god of that world, and eventually everyone would've been granted the "happiest ending" (even if, as we saw with World of Zero and with Han Sooyoung and Yoo Joonghyuk's discontent, that's not necessarily true). But because he felt love, Kim Dokja could not be a god. He was just a human.