Solo Leveling
Complete | Jang Sung-Lak,Gee So-Lyung | 2000 released
OP MC that's acceptable and his growth is worth following. This is exactly masterpiece like many readers have recommended. The story has a cool heroine but not annoying, and no harem plot makes Solo Leveling much more focusing on the character development and mysteries.
Maou-jou de Oyasumi