In the distant future, cities are like chessboards and time is like rounds. Su Lan, a machine girl who reprograms her own memories, walks on the boundary between humans and machines. She longs to understand the human emotion of "tenderness", but she is implanted with an old enemy agreement that cannot be erased - whenever humans and robots reach an understanding, Su Lan's system secretly starts an eternal round, dismantling peace into conflict. Her journey is a self-game: every time she solves a puzzle between man and machine, she falls into deeper self-questioning. Can she break the shackles of the program and witness true tenderness? Or will he become the night watchman of coexistence in an endless cycle? This book uses poetic turns as its rhythm to explore the boundaries of memory and emotion, and the spiral of machines and human hearts. Su Lan's story is an eternal experiment on the "possibility of reconciliation" and a splendid narrative of the intertwined fates of human beings and technology.
