My Sister-in-law's Secret Garden

Not long after my mother died, my father, who had lost his wife in his prime, married a young and beautiful woman to be my stepmother. I didn't expect that this would be the beginning of my nightmare.
From then on, washing and cooking, sweeping and mopping the floor, all the dirty work is mine, until one day, I accidentally discovered her secret in school, and from then on unveiled my flying life.