Big Brother! This Is the Adoption Proof—I Don’t Want a Sister-in-Law!

[Multiple female leads · No blood relation · Tsundere sister who is sharp-tongued but soft-hearted · Sweet romance]

Su Xiao was reborn on the day after his parents died, when he and his younger sister Su Wanning were adopted by different relatives.

In his previous life, the siblings were separated like this and never contacted each other again.

When they met again, Su Wanning had become an urn.

Because of depression, she took her own life at the age of 18...

Having been given a second life, Su Xiao swore that he would never let anyone take his sister away again.

In front of everyone, Su Xiao voluntarily became Su Wanning’s guardian and took on the responsibility of caring for her.

Good news: his life now includes a cute and beautiful younger sister.

Bad news: his sister is cold and tsundere, and ignores him.

Su Xiao was not anxious. He only wanted to spend the rest of his life slowly healing her.

Until one day, he brought home a girl, and the girl smiled and said, “Wanning, I’m your future sister-in-law.”

That night, Su Wanning, who had always been silent, knocked on his door for the first time.

She slapped a document against his chest, her voice carrying tears and possessiveness she herself had not noticed.

“This is my adoption paper! Bro, are you going to leave me too...”