After Passing Through the Book, the Cannon Fodder Concubine Frantically Escapes from the Main Plot

Once through the book, the cannon fodder lady had to stay away from the original main plot and go deep into the palace, hugging the heroine's thigh tightly, and met a young man who was upright and old-fashioned. He was usually quite funny, and he could be regarded as a childhood sweetheart. The smart female protagonist who wears books and cannon fodder × the serious male protagonist who is a down-and-out champion