Novel?

There is

Do you happen to have the link?

You can read the novel on wattpad although it's not full (@/dumbbellkaghorl)

Here ya go
https://www.novelupdates.com/series/the-precious-sister-of-the-villainous-grand-duke/

Thank you so much !!!! Do you happen to also know where the manga leaves off in the novel?

Sorry, I don't. I haven't read the novel yet (╹︿╹)