This work is: the author's self-entertainment
Su Wanxing bound a system that allowed her to travel into the world of the novel and save the heroine.
World 1: A few things about the eldest lady and her maid World 2: A few things about Yao Ji and Yuan Lord
World three (current): the end of the world (this world will be filled in later)
World Four: Strange Tales of Rules
World 5: Online game "Star and Moon"
