Dear Mark, We've been dating for almost three years. It's been a happy three years but now all of a sudden you've been acting different. I'm fearing something but I want to deny it. You're so nice, you couldn't be that kind of guy, right? Of course not! But, then again, there are some signs. Mark Oppa... Are you cheating on me? Love, Heo Jieun --- This is story comes from my own mind and if there's another story that's extremely similar then it's just a coincidence. Please don't steal my ideas and please enjoy my book.