Theory Time: I think Yeyul may not be Gabin's daughter? Maybe a the 6th brother's full biological sister, because before he's mentioned he feels she familiar when calling her brother. But that's just a guess on my part once they brought up the amnesia
Comment by ChaoSmitty on Survival Methods of the Cannon Fodder Daughter - Chapter 40
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@ChaoSmitty omg you could be right!