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I hate this Trope that many action manhwa writers make with women; using women to either make a character soft or to help move the plot towards something, especially when they make characters dumber because of that.
Yuna was likable in the beginning, she wanted to grow, to be stronger, and to help, but now she is just there to conveniently make Peter softer (take care of someone, get hurt for someone, etc.), and as a way to move things towards a certain direction (to show again and again how Peter could brake expectations).
I am more annoyed by Yuna because she was supposed to have had missions before, she advanced in weaponry, she accompanied and saw what Peter can do; she was meant to be a badass and now she is just there.
His friend from Glory is another thing too; she knew how to fight, she even fought Alapied, she is good with information and everything, but we have seen her less and less in action...it's like the author picked certain characters and won't pick up the female ones, except to be worried for Peter. Nathaniel was supposed to have been not only a doctor but a killer too. She was the same age as the sword apostle (forgot his name, sorry), and he can still fight without the undominant arm, but she was treated as this granny by everyone.