I'm a Terrible Student, but I Can Cultivate Through Sheer Skill

A struggling student’s comeback begins with being made to stand in the hallway outside the classroom as punishment by his teacher... This novel follows the ordinary-person path. The protagonist won’t be invincible from the start, and his golden finger won’t be absurdly overpowered! This isn’t a mindless power fantasy, and there’s no harem! The author has been reading novels for twenty years and likes things to make sense! The setting isn’t grand in scale, either. The protagonist isn’t trying to save all of humanity, just protect one country and one family! The story is set on Blue Star, but not on Earth! Any similarities are purely coincidental!