Wait wait, wasnt mc was the first born? And didnt he only have two siblings before? So where did this big noona came from? If she was the youngest then it is understandable since mc used the exercise to boost his manpower like we saw in previous ch but they said she is the firstborn. So I dont get it tbh

Yamete KudaSaiAh
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Manhwa
YouTube🔻
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Manhwa