Completed:
Ubel Blatt (JP) - Medieval fantasy revenge, kinda like Berserk
Dai no Daibouken (JP) - Adventure of Dai. Classic Dragon Quest
The Breaker (KR) - Ordinary Korean student gets involved in the martial arts world. Ended on a cliffhanger/hiatus.
Karate Shoukoushi Kohinata Minoru (JP) - Cowardly guy learns karate and becomes a professional. Similar to Hajime no Ippo.
Dance in the Vampire Bund (JP) - Modern vampires announce themselves and make a new country. Has follow-up spin-offs.

Ongoing:
Ravages of Time (JP) - better than Kingdom. More artistic and focused on the strategies
Vagabond (JP) - Story of Miyamoto Musashi. By the same guy who made Slam Dunk
Grappler Baki (JP) - Long battle manga involving fighters from all around the world. Many continuing series. Takes some time to get used to the art
The Gamer (KR) - student gets a gaming leveling system, fights against mobs and hidden powers
Gin no Saji (JP) - Silver Spoon. Guy masuk agricultural school. Lawak.
Release the Witch (CN) - guy gets isekai-ed to be a prince in a world where witches are persecuted
Metropolitan System (CN) - guy gets a system to upgrade himself and his strength in a quest to get fame, fortune and women
Dimensional Mercenary (KR) - guy joins a company specializing in completing isekai scenarios (each arc is a different life)
God of Blackfield (KR) - mercenary reborn into a student and immediately gets in trouble with gangsters and criminals
Moshi Fanren (CN) - Zombie apocalypse