Cinderella in the Prince Who Wears the Book

Song Yihu traveled through time in a Mary Sue novel. On the first day, she offended a famous academic in the city because she accidentally occupied the seat of the Mary Sue heroine, Lin Xiaoxiao. All parties ridiculed her for overestimating her abilities. The yandere male co-star walked up to her with a gloomy face: "Woman, go and apologize to Lin Xiaoxiao immediately!" Miss Song said with a smile: "It's a bright day, what are you dreaming about?" Is it because I have a good temper or you are too indifferent? #A story about a young lady who turns into a supporting female character and kills everyone. # Is a Mary Sue a Mary Sue, or is a Mary Sue not a Sue?