i keep wondering why the red thread flickered to the girl yeon helped. seriously

I was wondering the same thing. Is it cos he is an introvert so any form of relationship would be a big thing for him? ( Feels like betrayal ...)

Or is that his supposed destined person? ( I really hope not put her in the bin )

Or it is trying to tell us that they didn't need the rock. That they could have chosen each other and not had to do the forced string thing ???? Cos they would have formed a strong to each other naturally

Too many questions