The Sweet Little Cub Coasts to Victory in a Period Novel

Manni has an older brother in the army, but he'll die in the line of duty three years from now; Manni also has an older brother at home, but he'll meet the female lead and ruin his life for her; Manni also has an older sister who can't wait to get married, but she'll be beaten to death by her husband; Manni even has a third older brother who's a bookworm, but he'll lose the use of his hands and feet and be disabled for the rest of his life; Most, most, most importantly, Manni has a mother who transmigrated here! As for Manni herself...