I am thinking, would it be possible Prince Yue knew YQ's real identity and tried to help her, but nevertheless she died and she gave him the bracelet/ he found it next to her dying body? He seems to treasure it; does not regard it as some kind of trophy he acquired after killing an enemy. If you guys take in account how YWS wears the ring of YQ all the time around her neck, I think it is the same with Prince Yue - a token to remember her (a dear friend). No way will you wear an assassin's personal belonging all the time, unless you regard that person as someone close to you.
This leads me to think, maybe YWS's real identity is way more important than we all think. And Prince Yue may know of it and try to help her against WuFeng. As we all speculate, she will turn against WuFeng at one point, and I think it will have to do with the way YQ died, cuz I really do not think she was killed by Gong family's people, but rather WuFeng's fraction inside the family.
So many questions and no answers at this point. But we are getting somewhere and we need a couple more episodes to finally get a glimpse of the bigger picture.