He Dan accidentally hit someone on a rainy night.
He appeared out of nowhere, claiming to be her half-brother, only ten months younger than her.
He Dan: "My dad died before I was born. How could he cheat on my mom and have you with his mistress? Was it a ghost marriage?"
Her so-called little brother corrected her with a serious face:
"My mom isn't a mistress. My parents were in love and meant for each other. It was your mom, the evil female rival, who barged in and insisted on breaking them up.
The dates don't match because I'm from a parallel universe, one where lovers end up together and the evil rival gets what she deserves. It's a HE ending."
He Dan: "...Doctor, maybe you should examine him again. Are you sure he didn't hurt his brain?"
Ten hours later, He Dan realized he might be telling the truth.
Because she and this little brother of hers, who was supposed to be her rival, had traveled back thirty years together, to the 1990s, when their parents were still innocent high school students.
Who will end up with whom in the future? It's all still unknown.
Come on, let's fight!
Let's see who gets to claim that spot in the family first!
It's either you or me!
Later on.
Her little brother got drunk and cornered her in a secluded part of the park.
He Dan realized what he wanted to do and turned her head just in time. His lips brushed her cheek and landed beside her ear.
"You can't," she whispered. "I'm your older sister."
△ The male and female leads are not blood-related (spoiler alert)
Theme: There is only one good mother in the world.
