Time travel + two-way secret love
Dual perspective diary (extra may be updated)
What appears to be a rapid blue shift to you is actually a slow red shift to me
BG Brave and enthusiastic international music student × bright but sensitive school belle
"The biggest secret in this life is that I like you."
In the first timeline, the man is twelve years older than the woman, but the woman is the same age after time travel in Chapter 1. She avoids lightning on her own.
The author will continue to update within half a year, but if no one reads it within half a year, I will run away and write Machiavellian articles.
Concept: Every secret love you wait for alone will be echoed in the parallel world