Leveling up alone

Seong Jin-Woo and other hunters pass through gates leading to dungeons in a parallel world. Bosses dwell here, and by killing them, you can close the portals and obtain valuable magic ore. Seong Jin-Woo is the weakest hunter in all of South Korea, so every raid he undertakes is a failure. While his companions slay monsters and mine ore, Jin-Woo simply survives. One day, Jin-Woo and a group of hunters find themselves in an unusual "Double Dungeon." They encounter a living statue of an unknown god—a Cruel Boss, who dispatches most of the party. Seong Jin-Woo escapes and, after the incident, gains a strange ability: he now sees an RPG-like interface and can level up his skills. After gaining this new power, Jin-Woo begins training. He has reached S-rank, but hides it to avoid being seen. And now he's returned for a rank reassessment.
The girl behind the ranking machine: "Hello! Come in, Mr. Song. "
There are 10 S-ranked people in South Korea. There are also guilds: White Tiger - Guildmaster Baek Yun-ho. Hunters - Chief Choi Jeong-in. Reaper, Scavengers, and Ajin.