Newly entering society, male lead Ye Shu, when poor to the point of sleeping in a park, accidentally rents a luxury mansion in Yunduanyuan for eight hundred a month. After moving in, he discovers that the gentle and timid An Suxue, bold and direct Xia Qing, mature and gentle Zhi Qiu, and machine-like rational Xiao Nuan—four girls with vastly different personalities—are actually the same person. As they get along deeper, Ye Shu gradually uncovers the truth of their splitting due to childhood trauma, and also finds that he has developed an inseparable affection for this girl. A bizarre cohabitation story slowly unfolds in laughter and tears.