He Dan accidentally bumped into someone on a rainy night.
The other person appeared out of thin air, claiming to be her half-brother, only ten months younger than her.
He Dan: My father passed away before I was born. Why did he cheat on me and have you with his mistress? Is it a secret marriage?
The cheap brother corrected her with a serious face:
My mother is not a mistress. My parents are in love and are a perfect match. It was your mother, a vicious female partner, who stepped in to break them up.
The time doesn't match up because I come from a parallel time and space, that HE ending where the lovers finally get married and the vicious female partner reaps the consequences.
He Dan: ... Doctor, why don't you check him carefully again, is his brain really not damaged?
Ten hours later, He Dan discovered that what he said might be true.
Because she and her cheap rival brother lived together thirty years ago, in the 1990s when her parents were still young high school students.
Who will be with whom in the future is unknown.
Come on, let's fight!
Let's see who can grab this birth spot in the future!
There is you without me, there is me without you!
And later.
The younger brother drank and cornered her in the corner of the park.
He Dan realized what he wanted to do, turned his head in time, and his lips brushed her cheek and landed on her ear.
"No," she whispered, "I'm your sister."
△ The male and female protagonists are not related by blood (forced spoiler)
Intention: Only mother is good in the world