Just one mistake

This is going to be Tae FF.

Mysterious boy
So, what about a deal. I will be your fake boyfriend and in return you will try to cure my problem.
Me
Fine. I am ready for this.
This is a tae ff. And it is going to be a text imagine. I really hope that you enjoy reading this. I am not a professional author so I will probably make lots of grammatical mistakes pls ignore them.
All the incidents in this story is imaginary only some characters are real. And the rest is all fictional.