I don't think so, Sean is the MC, Eugene is the kid who was on the road
The child who was on the road had golden eyes, while Hyun has blue eyes
And Eugene also has golden eyes
If Sean was the main he’d be at the center or at the very least behind hyun instead of the director and the nun and the nun and director would be on the Side. Placement is very important Sean is on the cover which means he’s a main character but he’s on the side, meaning he’s ONE OF the protagonists, not the protagonist.
I researched a little more about the manhwa and found an image where Sean was alone in the center, I don't know if it's the cover, but the image exists
I also saw some posts on reddit talking about the manhwa and some people say that for now Hyun is irrelevant to the story
"His introduction is really misleading and confusing and + hes on the poster so as now hes kind of irrelevant as of chapter 6 but ik ptj is cooking smt that will connect everything together and huynho will become relevant"
A comment I saw on reddit
Hyun was the kid in the road. I guess, and Sean is the #2 something. Old woman is not simple. Hyun is definitely a main.