After Seeing the Barrage, the Little Wolfdog and I Had a Fight

Actually I'm Looking for a Book

The female protagonist's name is Sui Xin and her mother's surname. The male protagonist's name is Sui Dongsheng and her mother's surname (the name seems to be this). It's a short story. It starts with the heroine looking for the hero because there are no seats in the library because the hero built a prison cell for her. The heroine is reborn.