No, it says preceded. Which means "came before". So, I would presume it's the MC in the What a Bountiful Harvest, Demon Lord!.
Wait, Wait. They are in same universe. I only started " What a bountiful harvest".
Where am I , Who am I ?!
Yeah, it's the same author and same universe. You'll find a bunch of easter eggs in both manhwas that reference each other. We've already seen Lloyd's and Javiers ancestors in Bountiful harvest. And the huge stone statue carved in the mountain in greatest state developer, is probably the MC or another demon from Bountiful harvest.
Wait, next demon king who is that ???!!!