Rebirth: the Heroine in My Book Became My Childhood Sweetheart

My name is Mu Zichen. I was reborn and came to a parallel world that was very similar to the original world. Originally, everything was fine, and I tried my best to make money and let my parents live a prosperous life. However, suddenly I discovered that I had an extra childhood sweetheart, and she turned out to be the heroine of the novel I wrote in my previous life! My name is Xia Mengke. I traveled through time and entered a strange world. I had a childhood sweetheart, my elder brother Mu Zichen. I should have been indifferent to him, but I found that I was particularly attached to him, and even had the urge to become his girlfriend! Mu Zichen (Xia Mengke): What should I do: wait online, it's very urgent!