When the male protagonist was sharpened by life into a "cold mask", he originally just wanted to live an ordinary life. However, one sunny morning, two completely different women broke into his life: one was a domineering and independent goddess-level sister, and the other was a sweet and gentle girl next door. But life is not quiet, and the hero's humor and cold personality are constantly being tested: in each plot of heart-pounding and teasing, an annoying sub-hero, the heroine's suitor, is also mixed in, constantly creating misunderstandings and frictions, disrupting the delicate relationship between them. Who can win in this emotional game? Who can impress Mr. Cold?