Yila defeated one boss after another, just like overcoming the obstacles and bosses in a game... The smallest boss was one of Caligula's sons, followed by the Demon King's army, then the disobedient monster leaders, and finally Caligula.
Afterwards, he dealt with the unexpected attempts on his life and then the Calamity...
At the very end, shouldn't there be a good ending?
However, reality told him "no," The Divine Snake Shedding told him... that this world was fundamentally unsavable. From the very beginning, all efforts were meaningless, and for that, it expressed its apologies.
But the Divine Snake Shedding didn't need to apologize... just as those who did nothing didn't need to apologize either. Perhaps Yila, who tirelessly exerted efforts and expectations on his own, was the one who was wrong.
The Divine Snake Shedding did not owe Yila anything.
