the manhwa really lost a lot of details to the point idk if they making up new things but this is just a guess, maybe the panel was referring that he had to choose what to do regarding both of them. whether to give the cure to yoo myung han, and whether to go to japan when his sis was like that and what japan had done to kr hunters cannot be forgotten but yeah we all pretty much know what he gon decide anyw
forgot to add why he needed to choose to give the cure to yoo myung han, idk if this will be spoiler but
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he cant really just give it away because lets say, thousand of people are suffering the same disease but he cant cure all of them because you know the potion he had in previous chapters for his mother isnt a lot
I’m actually so confused rn, what is he choosing from ? His sister’s life isn’t at danger, she’s just scared. And um he’s like the only person who can defeat that gate so it’s either do it now and maybe die or everyone dies eventually