@eng1 I have learned to just ignore small inconsistencies like this in manwha. Though I do agree its a bit weird that she was able to crack her wrist and walk away scot free. That one I cant really overlook considering the girls personality.
@kenx: she could have used a note app to keep the phone number, it would be less suspicious when she hold a phone than having a piece of paper.
As for the sister, she maybe a spoiled princess and acted like a brat, but it didn't mean her parents would let her wander around with no bodyguard like that.
didn't she say that taking the leading role from the FL could destroy world in a previous arc? but i guess it's ok if it's to punish violent bitch and protect girls from being raped