Koushakuka no 4 Kyoudai to Kazoku ni Natta

“What do you mean my mom is remarrying a duke!?” When her mother remarries, Anneliese suddenly becomes the daughter of a ducal house and is told she’ll be living under the same roof as four new brothers. Life in the unfamiliar ducal estate is hard enough with spiteful servants, and each of the brothers seems to carry his own troublesome baggage as well… Original Webtoon