Stuck with My Buddy's Prodigy

Entrusted with his brother's "genius" daughter, the male lead discovers she is actually his own child from a past relationship. When the ex-girlfriend returns to reclaim custody, he fights back to protect his girl. As he grows close to the gentle female lead, he is shocked to learn his daughter is a transmigrator who rewrote the tragic fate of the female lead. The three finally find happiness together.