Dong Family Eldest Son's Diary

What if Dong Zhuo's older brother Dong Ze had lived? What if that Dong Ze was a reincarnated person? What if Dong Ze worked hard for the sake of his younger sister and subordinates living on? A protagonist who defeats approaching enemies left and right! All of it for his sister! There's absolutely none of that "I'll save the world!" component! A protagonist with a bit of a sister complex spends another day leisurely going about his daily life—that's the kind of story this is.