this is not related to 1st season
the main character is different Mun from dickless dimension
Mun moved on from his crush on HANA because his dick got chopped off while jerking off

and he become a cheap copy of Superman without dick.
he is so powerful that he moved on without any reason.
HANA is now like his sister, who stare at there sisters butt in season one, of that Mun isn't this mOOn

Most of Korean drama confuse sister and girlfriend because OPPA is used for both husband and brother
DO the don't know the difference between brother and boyfriend or they don't have a word for brother because to them both are same