What Should I Do If My Sister Doesn't Remember Me?

"Sister, don't you remember Xiaoyuan?" "Remember... Remember?" Fu Yuanyuan doesn't know why? Obviously, I was only a three-year-old child at the time, so I shouldn't remember anything, but I could always remember that touch of red under the gentle sunshine, as if it was imprinted in my mind... But when the two meet and find that their sister can't remember him, what should they do? Online! Urgent! —————— "Xiao Yuan'er~ Do you want my sister to be your wife?" "Think!" Mission: Endless love, eternal youth