Wedge:
The family was originally a peaceful and happy family, but because of an accident, the three sisters had to spend their childhood on the training ground; the people who were going to get married disrupted their happy life because of a time earthquake; the parallel lines that did not originally cross, merged together because of this...
There are no absolutes in the world. The original "original" no longer exists, and what greets them is a brand new life, full of strangeness but also familiar.