Kind of an alternate universe where Isaac and Ga On are basically the same person, meaning Isaac isn't Yo Han's brother, he's just a friend. (Everything will be explained along the way). After his lover Isaac (Ga On) dies in the church fire, Yo Han decides to take Elijah in, since the girl lost her parents tragically and he was basically the closest person she had. They're both grieving and their life isn't the same after that incident, making the both of them very closed off to everything and everyone. Things change when ten years later someone looking exactly like Isaac comes to work with Yo Han. The man is a spitting image, but has a different name and some blank spaces in his resume. It seems like it's just a coincidence that Ga On looks like Isaac, but Yo Han can't help but feel like his new associate judge is oddly similar to Isaac, not only looks-wise. Or the one where Yo Han and Ga On were lovers before and Ga On almost died in the fire, got lost, lost his memory and got a new identity, completely oblivious to the fact that he's working with the man he used to be in love with. (btw there's no revenge shit here I guess)