if they are wearing the same color shirt and short today, and they are facing you with their back, I think we also don't know who is WX and who is JYJ. Hehe..
But PP has more "power" behind her back, rite? LOL Meanwhile, i don't know that WX is already that older, i thought she's in the same batch w/ WSX Oh yeah the twins also share one more thing in common = they reborn after overcoming their injuries