He wanted a regular showdown—none of that “I’m kidnapping your lover to have for myself” I guess he really said “wait no, that’s not my character motivation”
Not spoiling, just my guess: Okay if we go by comic logic, then that “younger brother close to Seungho’s age” is totally gonna be white haired guy right?? That would be the most dramatic thing to write, and this comic REALLY likes to do dramatic.
YES that is indeed Mother! (Funnily enough, he actually does look like a mix of the two of them haha)