
Of course, it is not the same plot darling, No big brain needed. But think about this :
- Real daughter vs Fake daughter
- Daddy believing Fake Daughter is the real one
- Real Daughter always tried to get her Daddy's love
- Daddy never showed love to his Real Daughter
- A magician of the Tower
- A dude that looks like Claude
Like...

Hm... but those... are bread an butter of those kind of novels... with minor differences... like...
Step sister instead of fake daughter...
Just liking more the other daughter instead on the mc for many any reasons...
Mc having to "conquer" the father/family/male lead's affection (usually under future death threat)
An OP golden tight that the mc latches onto.. (tower magician, holy beast, op knight, prince, duke, etc..) who *gasps in fake surprise* usually tends to end up being the real ml...
And well... they are usually in a fantasy European historical setting... there's always, always a blondie blue eyed dude... or the mc... or the antagonist... but always at least one... that will be compared to either Claude or Athy... or a black haired red eyed to Lucas... even long haired mls...
Really. It's all cuz HMMP was the first webcomic with those settings to become really popular. The art of the previous ones were either too simplistic for a romance comic or too detailed/exagerated like the Chinese ones... It was like the eureka moment where they found the balance of what kind of art would be popular... so everything now reminds us of it in some way.
I do love HMMP. And this is not a critic on it or anything.. more like explaining why theres always comparison with it. That only doesn't happen in modern or ancient oriental setted comics...
Advise: If you don't take those minor differences a lot, and I really mean a lot, in consideration, at some point you'll only see more of the same when reading these kind of romances.

Oop i didn’t really put that together (I’m a little slow) ... I admit defeat (〜 ̄△ ̄)〜 but this trope is non-unique to "suddenly became a princess". It wasn’t the first manga with that trope and honestly you can find sooooooo many with that plot. Suddenly became the princess is the best though and can’t rrly compete (mainly cause of the god-like art )
- The beloved little princess
- Daughter of archmage
-A queens law of survival
- Am I the daughter ?
-Daughter of the emperor
( there probably more but can’t think of any rn)
As if it was not similar enough to "One Day I Suddenly Became a Princess"