A Textbook Example of How Not to Transmigrate into a Book

A heads-up: this is the author's first book. The logic falls apart, and there are lots of problems. What's it like to transmigrate into a fantasy novel? Especially when it's a novel you wrote yourself, without an outline. Yang Xing himself says he's completely unfazed, and even wants to strangle his past self for writing it. Wait, where did all these NPCs come from? Who added this plot? I didn't write it! Am I not the protagonist? Why can't I use his skills? The book: Surprise! A new plot! Yang Xing: "..." A top with off-the-charts combat power and possessiveness (Yan Yufeng) x a bottom who knows all the tricks but always gets tricked himself (Yang Xing) Theme: