Trapped in a cold, loveless marriage, Li Xiu'ai has been watched for a long time from the opposite window by Luo Shengchun—and desire and shame ignite in her at once. Her father-in-law catches them, they meet again on the subway, and her body is tested across one boundary after another; the more she runs, the deeper she sinks. Before the bed is even bought, the relationship between watcher and watched has already been rewritten—and it's only just beginning.