Pei Yu, the sole heir of the powerful Pei family in Wangjing, stands at a funeral for his beloved Shen Lishu, known as Sweetie. Dressed in black and visibly broken, he kneels before his rival Xie Changyan, begging to see her one last time. Xie Changyan, who holds a grudge against Pei Yu, reveals that Shen Lishu is not in the coffin. Instead, he presents a jade box containing a single finger bone with a distinctive scar—a scar from when Shen Lishu protected Pei Yu years ago. Xie Changyan explains that Shen Lishu was kidnapped by beasts seeking revenge on Pei Yu, thrown onto a snow mountain, and frozen to death before being devoured. The revelation shatters Pei Yu, who realizes their final argument led to her death. Overcome with grief and regret, Pei Yu spends months digging through the snow on the mountain where she died. He reconstructs her remains and, in a final act of devotion, stabs himself in the heart, placing her finger bone into the wound before an avalanche buries them both.
The narrative shifts to their childhood. Six-year-old Shen Lishu, abandoned and living alone in a dilapidated villa with only a neglectful nanny, finds a shivering, mud-covered boy at her gate. This is Pei Yu, the autistic heir of the Pei family who has escaped his secure home. Despite her own loneliness, Shen Lishu takes him in, offering him warmth and food. When Father Pei arrives to retrieve his son, he discovers Pei Yu refusing to let go of Shen Lishu. Recognizing her positive influence, Father Pei invites Shen Lishu to help Pei Yu with his therapy. A deep bond forms between the two children; Pei Yu becomes fiercely possessive and dependent on Shen Lishu, while she provides the emotional stability he lacks. They grow up together, with Pei Yu attending kindergarten alongside her and guarding her from others, particularly Xie Changyan, who transfers into their class.
As they mature, the dynamic evolves. Pei Yu, now a powerful and cold businessman, becomes increasingly obsessive about Shen Lishu, referring to her as his Sweetie. He isolates her from potential suitors, including Xie Changyan, who harbors his own unresolved feelings for her. The story highlights Pei Yu's transformation from a withdrawn child into a dominant figure who controls every aspect of Shen Lishu's life, yet remains vulnerable only to her. Their relationship is marked by Pei Yu's intense jealousy and Shen Lishu's gentle endurance. The tragedy unfolds when a misunderstanding or conflict leads to Shen Lishu's death, leaving Pei Yu devastated. The narrative explores themes of love, loss, and redemption, as Pei Yu grapples with the consequences of his pride and the irreversible nature of his actions. The story concludes with Pei Yu's ultimate sacrifice, joining Shen Lishu in death, symbolizing his eternal devotion and the tragic end of their intertwined fates.
