Heavenly Demon Instructor

After the Portal Impact catastrophe strikes Earth, Park Hyunsoo loses his parents before his eyes. His only close family is his younger sibling, who is unaware of the danger around them. Determined to protect them, Hyunsoo struggles on despite being too weak to help, repeatedly finding himself on the receiving end of contempt. Then Chungyeong appears. A martial arts master from Murim who has traveled through time to reach this world, Chungyeong begins teaching Hyunsoo hand-to-hand combat.