It is difficult to become a mistress through time travel, but it is not difficult to be a mistress who can be promoted to be the main wife.
The mother-in-law is not the husband's biological mother, so it is difficult to be a daughter-in-law, but it is not difficult for her husband to call her Huang Taiji.
It is difficult to be a head wife and only have daughters, but it is not difficult to have a niece named Bumbutai.
(Short story)