Shen Yuanning, the only precious daughter of the Shen family, was born with her own background music, which only her seven older brothers and immediate family members can hear. She has been carefully pampered by her family since childhood and grew up safely under the love of her seven older brothers. Until the eldest brother brings back his fiancée, Xu Zhiwei, her peaceful life is completely shattered. Xu Zhiwei appears gentle and quiet on the surface, but whenever she gets close to Shen Yuanning, a warning melody sounds. She hides selfish motives and repeatedly plots in secret to frame Shen Yuanning. The members of the Shen family have long seen through the truth, and everyone is united to protect the younger sister, expose Xu Zhiwei's hypocritical face, resolve crisis after crisis, and stage a heartwarming and passionate story of protecting the younger sister.