Ra In-Soo

From Easy Going Scans: Fantasy Action Legend that follows brother's diary! After his brother Loki's death, on Tyr's 17th birthday. Loki's diary is delivered to Tyr. When following the diary step by step, Tyr realizes that everything that's happening around him is already recorded within the diary.

There's a rift between Hell and the mortal world, and lost souls have been escaping to torment the living. To deal with the problem, the King of Hell released Majeh, the greatest swordsman of the underworld, to stop the wayward souls.