its not entirely his fault since he had never experience any healthy relationship neither with his family or partner, and he got knocked up at early 20s. And he always feel so insecure with his surroundings even hes currently goin thru a good life with dojin and byul.
i think the side story is about their past life before the reincarnated like how they were now? ITS SO GUCKIN CUTE I CANT STOP SOBBINGGG