Prince, you got to have the balls and ask her "why are you marrying that man?" She'll eventually tells you her love life and you'll understand. I know you show respect to her and I don't hate you just bc you're really obsessed of her. And I better hear you say "IU!" when you guys are in a relationship!!
I completely forgot about the ML.... Is my baby ok?
SPOILERS
Yes he's OK. Remember the candy that Tia gave him when they first met. It was actually medicine for the Poison. Also before Tia left she told Perez to practice swordmanship and he gets so good at it that he's the first ever person in history to master sword aura at 13.