Reborn: The Heroine in My Book Became My Childhood Friend

My name is Mu Zichen, and I was reborn in a parallel world remarkably similar to my old one. At first, everything was fine. I was doing everything I could to make money and give my parents a comfortable life. But then I suddenly discovered that I had gained a childhood friend, and she was the heroine of the novel I had written in my previous life! My name is Xia Mengke, and I transmigrated to an unfamiliar world. I now have an older childhood friend, Mu Zichen. I shouldn't have felt anything for him, but I discovered that I was incredibly attached to him, and even felt an urge to become his girlfriend! Mu Zichen (Xia Mengke): What am I supposed to do? Asking here, and I need an answer fast!