Su Wanxing, a modern pastry chef, unexpectedly travels through time and becomes Su Wanxing, a timid and bullied illegitimate daughter of the Prime Minister's residence in the Great Jing Dynasty. The original owner was framed by her legitimate elder sister and drowned. After arriving in her body, Su Wanxing abandons her former cowardice and uses her adorable yet resilient personality and modern knowledge to carve out her own life in ancient times. By chance, she encounters Prince Jing, Xiao Jue, a cold and taciturn man suffering from a hidden illness. With her sweet desserts and straightforward personality, she breaks through his resistance to women. When her legitimate elder sister, Su Yuran, repeatedly schemes against and makes things difficult for her, Xiao Jue fiercely takes her side and showers her with exclusive affection. What begins as curiosity and attraction gradually turns into wholehearted devotion and an unwavering desire to keep her by his side.