Wen Yifan, by chance, ends up living with her high school classmate Sang Yan, whom she once rejected. They keep their distance until Wen Yifan learns from Sang Yan that she sleepwalks, intertwining their lives once more.

该剧改编自竹已的同名小说，讲述了机缘巧合下，温以凡跟曾经被她拒绝过的高中同学桑延过上了合租的生活。两人本井水不犯河水，但因为温以凡从桑延口中得知自己梦游使二人有了交集的故事。