King Of Octagon manhwa, The thrilling MMA conquest of a rookie genius fighter Wheesung, who was a promising sportsman with a natural sense of movement, quit exercising in high school due to an injury and lives a part-time life. In the meantime, he is invited to the match of MMA amateur Junghwan He feels a strong thrill at the power of Octagon' that he encounters for the first time. 22-year-old Hwi-sung Lee, who was busy running away after giving up on everything. The moment he climbs into the Octagon, a spectacular flight that no one expected begins.

Ninjas… Ninjas were… merciless demi-gods, ruling Japan with their karate in the age of ninja tranquility. But, some committed a forbidden form of hara-kiri storing their souls at Kinkaku Temple for future resurrection. Their lost history was falsified and concealed and the truth about these ninja was long forgotten. Now, in the future where the universalization of cynbernetic technology and electronic networks are God, suddenly, sinister ninja souls, resurrected from thousands of years past are unleashed on the dark shadows of Neo-Saitama. Fujikido Kenji, is a salaryman whose wife and child were killed in a ninja turf war. In a brush with his own death, Fujikido is possessed by an enigmatic ninja soul. Fujikido cheats death and becomes Ninja Slayer. A Grim Reaper destined to kill evil ninja, committed to a personal war of vengeance. Set in the dystopian underworld of Neo-Saitama, Ninja Slayer takes on Soukai Syndicate ninjas in mortal combat.