Became the youngest Sister-in-Law of the Ruined Harem Male Leads

I was reincarnated into a hopeless, run-down reverse harem novel, but for some reason the female protagonist died. The shock of the original being destroyed and then disappeared was short-lived. The older sisters started to connect with the male protagonists. To the playful and obsessive emperor, the mature and affectionate eldest sister. To the blunt worldview’s strongest prosecutor, the second older sister who is a romance genius. To the playboy genius Ma Top-ju, the cynical youngest sister. Me? I’m six years old now, so it’d be a mess if I had a love line. Anyway, the older sisters got married because they seemed to get along well with the male protagonists. But… “Liliana. Call me oppa.” “Out of all the brothers-in-law, am I the best?” “It’s the emperor’s will. The youngest sister-in-law will live in the palace treated like a princess.” I just want to go back to the time when the four of me and my older sisters lived together.