Let's get the basics out of the way first. Noel Noa is the main character from the Korean web novel 'The S-Classes That I Raised'. He starts off as an F-rank hunter, basically the absolute bottom of the totem pole in a world where monsters have invaded and people get powers. But the twist—and it's a massive one—isn't about him getting strong himself. He's a 'big brother' type, literally and figuratively. His younger brother, Han Yoojin, is the actual protagonist. Noel's role is fascinating because he's presented as this incredibly talented, S-Class fighter, but the story we read is from Yoojin's perspective, a regressor who's come back to save his brother.
So what does Noel actually do? He's the golden child, the benchmark, the unattainable ideal that the real protagonist revolves around. His power is insane, but his character is almost a narrative device. He's the motivation, the goal, the living proof that Yoojin failed to protect in a past life. He plays the role of the 'loved one in danger' taken to an extreme, because he's not some damsel; he's arguably the strongest person on the planet, yet still needs saving in ways that aren't about physical strength. It creates this delicious tension where the overpowered character is actually the one being guarded by the seemingly weak one.