In order to follow the beloved sister who passed away, he jumped off a cliff. In order that his beloved sister would not be tortured in the eighteenth level of hell, he signed a contract and exchanged conditions with the creator of another world to allow his sister to return to the world, while he did go to another time and space to complete responsibilities and obligations that belonged to him and those that did not belong to him. Under the strict feudal hierarchy where men are superior to women, I, as an unqualified killer, vowed to integrate the advanced knowledge and concepts of equality of the 21st century into this evil old society.