
I have a few suggestions that have decent MLs for you:
Way To Protect You, Sweetheart.
I'll Be The Matriarch in This Life.
Please Throw Me Away.
The Villainess Lives Twice.
Beware of the Villainess.
How To Protect The Heroine's Older Brother;
I probably won't be linking to them though. Sorry! But I hope there's a few there that you like and haven't read. Although you most likely have read the 4th and 5th ones!

My apologies! I'm not a fan of Callisto to tell you the truth. But many people can and do find him decent. And I probably shouldn't be basing the list on my preferences only. So thank you for that, as well. And in that case I should probably add Daddy, I Don't Want to Get Married (along with Sincerely I Became A Duke's Maid, The Villainess Is A Marionette, Raeliana and The Lady's Butler), too. I mean yes the ML in D,IDWTGM does try to kill the FL but in his case this is definitely because his actual (I say 'actual', because it's even clear in the prologue that his intention was neither to kill nor to torture Jubellian in the novel the FL read) attempt does indeed occur long before he gets to know her.
But from the title of this thread it seems the OP is looking for a unique plot. But I think we're still fine because I believe at least five of the ones we've mentioned should have unique plots!
But basic ass ML lmao please At this point if I found a nice ML I will honestly cry happy tears