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I'm actually surprised that Seongjoo's(?) family line has continued until this era despite the curse that they have, you'd think ever since back then, one of those descendants will be like "the family bloodline will end here because I won't subject my children from the curse" or something. It's not like in Demon Slayer where they have a purpose for continuing.
Even if the excuse is they are gambling that one of those children will survive the curse, you don't really want to see children dying just to see that probability happening.
I don't know if I missed something or misinterpreted but how did even Seongjoo's parent able to survive the living up to 20 yr old curse if the family is almost guaranteed to die? Or is that selected who'll get cursed? Then shouldn't Seongjoo being an exception shouldn't be really a big deal? (I meant them being overprotective)