The practitioner's Dan energy originates from the moon sun and five elements, the body has five elements, since all living things have the five elements, regarding the issue if humans can train the Dan, there are two main views: one party believes using people will result in many difficulties, thus they only use the elemental energy from external sources, they are called true practitioners, the other party believes the body is the supreme thing under the heavens, in order to increase their strength exponentially, they use other people, they are called nefarious practitioners. True practitioners and nefarious practitioners' battle, is now unfolding!!! - Gamernissem

[Summary by OSTNT] In a world of martial arts, a young boy named Wu was unable to practice martial arts due to his special body. Will he accept his fate and live his life bullied and looked down by others, or will he rise and become a master?

From Manga Box:
One day, a yakuza gang member is attacked in Roppongi, Tokyo. This is only a prologue to one man's revenge story, triggered by the events of twenty-two years ago. The flames of revenge burn in the darkness of the city. By the author of Hitoshi Tadano, Chief of Special Operations, Kimio Yanagizawa.

A rising boss in the underworld is forced to lead a double life as a police officer and a gang boss in order to find the killer of his brother.

Completed printed version
Author remade the series at Lezhin

Lezhin Publication

From: Easy Going Scans

Some corrupted high ranked officers within the palace are accusing the crown prince Sado of high treason and ask for his death! What will the Emperor do to save his son?

A fusion heroic historical about a crown prince in a wooden chest about to meet death, but actually turns out he has bigger influence and authority beyond imagination.

Adapted to K-Drama.

From DragonVoice: This is naturally a shounen manga and deals with the orphaned boy Hyouta who's in a group of traveling entertainers and one day he encounters a fine noble woman named Tokiwa who requests the group to perform at her home. But her intentions are not what they seem to be... Read the rest for yourself ^^ The first chapter will probably remind you guys of the story of "The Prince and the Pauper".

From: Easy Going Scans

Everyone in his Yakuza gang looked up to him.

He was the boss's favorite pupil, but then in a single night, after he had won so many territorial fights for his gang, he lost everything! Why?

Sihoon is a boy who lost his parents and lives with his older sister. This story begins as he meets Mephisto that came to the world to find Faust and makes a deal with Mephisto to supervise the fights between Mephistopheles and Faust.

This is a mixed martial arts fighting manga about the Miyazawa school of martial arts. Initially, it is about Kiichi trying to heal his father after he was nearly killed by his brother Kiryu. But then it goes on to be less about that as his father recovers and some tournament style fighting begins. At that point various apparently overwhelming opponents will encounter Kiichi on his way to the top. The objectives of the various characters start to play a more and more important role, as well as the different philosophical projections of several martial arts and disciplines. (Somewhat maybe like a modern day Samurai story.)

This is also a continuation of Koukou Tekkenden Tough which followed the main character, Kiichi, when he was younger and was training under his father Seiko Miyazawa. (Knowing the prequel isn't necessary at all.)

Wild's High has a 42-year history as a fighting specialized, girls only, private high school meant solely for the elite. It is also the place that Wild's-League is held: the most popular event in the country and the only place in the world where teenage girls have brutal fights with their lives on the line.

One year the school changed from a girls only school to a mixed gender school. The only male student, Song Jae Gu, has been granted a full 3-year scholarship regardless of grades. Being someone who had to spend every moment either working or taking care of his younger brother and sister, he accepted.

But after meeting Queen, the bloody champion of Wild's-League, drenching her in coffee, calling her a monster, and getting caught seeing her while she was taking a shower... his scholarship could prove fatal.