If two different world lines coincide, use a mirror as a channel. Is it too busy to have an illegitimate child in the family and deal with another self at the same time?
Maybe two people who look exactly the same are not living the same life. When the dark side of the heart is infinitely magnified, is it still the same person with the same appearance?
Shuo Di still remembers that a long time ago, she looked at that idiot who was unaware and said: "She is so beautiful, I can't bear to bully her."
Give Narcissus a try!
Concept: We are all our own big umbrellas in the rain