I Married Into the Mermaid Clan as a Substitute, Only to Discover My Husband Was My One True Love

When Shennuo was little, his merman brother stayed by his side for an entire month. He always thought of that time as the happiest beginning of his life. Afterward, the people who bullied him stopped, and his legs got better. Twelve years later, when he enters the merfolk tribe in place of another as a bride, he discovers that the one he has come to find is none other than his merman brother. Dominant merman gong x cool, reserved human shou