haha in her defense the brown haired dude was supposed to fulfill the plan not the duke. The duke just got stubborn about it. Which at this point of the story is just dumb. The writer is just making drama up. Like I dare to say that they are both behaving out of character now. He would not want to pretend to be someone elses lover, and she wouldn't let him based on the last few chapters before this one.
Her original plan was a great one since it would push the other two characters closer. But the writer seems intent on adding more useless drama.
My thoughts exactly
like if you’re just gonna be anxious don’t create a plan like this jeez