I need spoiler!

Read the novel. It's pretty accurate

And by accurate, I mean the manga follows the novel religiously

But I suck at summary the story and getting the key points of the story ╥﹏╥

May I ask where the noble is for this manga?

Here ya go: https://www.novelupdates.com/series/common-sense-of-a-dukes-daughter/

You're probably gonna wanna read Chapter 60 in the novel. It's the continuation of the latest manga chapter. Enjoy

Thank you