While chasing the serial killer who murdered his wife, Kang Yu-min died and transmigrated into a body of a 16 year old boy, Moon Gi-wan, who lived in an another world where cultivation existed. In this new world, martial energy was everything and it was everywhere in the environment like an oxygen. It was an essence of life to everyone. Without it, the world wouldn't work naturally. People would cultivate the martial energy to become stronger and reach greater heights through it. The higher one's cultivation is, the more that individual gets recognized by everyone in the world. When Kang Yu-min stumbles upon such world, he was confused at first and was also clueless on what to do next, but after searching for a purpose in life, he finally understood what he had to do and for that, he will go to extreme lengths and achieve it at any cost. Join Yu-min with his journey on becoming the strongest martial spirit cultivator in the world.