@Lkv-976 The novel for solo leveling or in novel term I alone level up,
its already finish and it even has the part where jinwoo have a son and from there on jinwoo will train his son to control the power of the sovereign cause for some reason the son has it too maybe because of jinwoo's genes it really did not explain if its genetic or not but maybe its genetic so in the end there are 2 shadow sovereign which is Jinwoo and his son (I forgot the child's name xD)