The Secret Genius Bride

After an accidental transmigration, she finds herself in the body of a village chief's young, foolish daughter, mentally stuck at age eight. At home, she is doted on by two protective older brothers, but suffers from the scheming and torment of her sister-in-law. Hopes for a peaceful life, but fate takes another turn. A letter reveals a 15-year-old childhood betrothal. Distant in-laws arrive. Her destiny: go to the city after New Year, marry, beginning a new life.