My theory

In my perspective I think Seongchan will be the only person not to escape. When saying the first two "roles" of the chant, the camera view was showing the killer—which may be unrelated, but I interpreted it a different way.

"The Blind" and the "Defy" = Bada is the 'blind' (has no ability to murder the killer, was not aware of anything for most of the game / had his memories altered, still in the dark about his true identity) and Doha is the "defy" (only one who can murder the killer as far as we're aware, defied the game by focusing on Bada and ignoring all the mechanics that "get in his way"). When it says the two must "mingle blood" I actually thought of it more figuratively than literally (such as blood relation), mingling blood could actually mean their love for each other.

And then Seongchan, he's the one who will "be granted the honor of seeing all things return to their proper place" which I think means he will watch as all the players escape and the game will go back to normal, but he'll still be trapped.

Along with this, I also believe that this ritual has taken place before, and the one who was "granted the honor" in the last ritual was Bada. After being sacrificed is how he lost his memories and as far as he's aware, he was just an NPC.. but what if he wasn't? What if he's only the 'blind' because the game wiped his memories, forcing him to become an NPC until a new round of players came to see through the ending again. And now with the ritual once again taking place, it's Seongchan's duty to take Bada's place.