Shang Yang and Shang Yi are fraternal twins who look remarkably alike. At school, they always keep their distance and never reveal their close sibling relationship to others. One is carefree and easygoing, while the other is cool-headed and outstanding; their personalities are completely different. After unexpectedly awakening memories, Shang Yang devotes herself to protecting her gentle, reserved younger brother. She carefully resolves the subtle tensions within the family and calmly navigates the social turmoil at school. Through their everyday interactions, the siblings gradually grow closer, discovering tender moments in life together and accompanying each other on the journey of growing up as they head toward a warm future of their own.