Maomao's mother is going to marry Marshal Lou as his fourth concubine, and she follows her into the Military Governor's Mansion. Everyone says the Lou family is a man-eating dragon's lair and tiger's den, and that she, this little burden, will surely not live long, and sooner or later will be driven out together with her mother. But— Eldest Young Master, I'll take Maomao for a horse ride! Second Young Master, the doctor, Maomao's health is left to me! Third Young Master, who returned from studying abroad, says Maomao is a little princess, and at the slightest disagreement takes her to monopolize a whole street. Fourth Young Master, depressed from his broken leg, pulls himself together to do rehabilitation, so he can accompany his little sister to play sooner.