At the start of the summer vacation, Wen Ye is "packed" and sent by both mothers to stay temporarily at her childhood friend Chen Yu's home for a month. One is direct, assertive, and loves teasing people, while the other is gentle, clean, and blushes at the slightest thing. Two frenemies who grew up together are forced to start living under the same roof. From co-habitation rules and cooking disasters to accidental group photos and piggybacking home with a sprained ankle, aided remotely by their mothers, their familiar daily routine gradually grows ambiguous. The two who previously considered each other "bros" begin to see the grown-up version of each other anew amidst moments of heart-fluttering and misunderstandings.