
Whenever I see So-yi, I think she feels the need to be the perfect daughter because that's the least she can do as an adopted child. She's doing her best, and maybe that's why she always clashes with Byul, whom she might think of as spoiled and taking everything for granted without seeing how lucky he is. But it's actually just normal for a child to behave like that.
I just realized it was introduce earlier the “human gate” by capricorn. I wonder if lucy can do it too in the future xD Shell summon the whole guild