남이 된 남동생이 남편이 되려 한다

My mother’s remarriage gave me a younger brother. I happily tried to bond with him; no matter how badly he behaved, I persisted. Will my efforts ever pay off? As we grew closer, Millian left to go to war, leaving me with a piece of letter. It has been five years since. Millian comes back and I find out that he has been expelled from our family. He is no longer Millian Edmore Rachel, he is now Millian Taylor and he is going to be my husband. (Source: KakaoPage, translated and edited)