An ancient, rustic bronze mirror creates a miraculous connection across time and space with the Tang Dynasty. Xiao Ran, a young man from the modern era, unexpectedly befriends the adorable and lovable little princess Li Mingda, who lives deep within the imperial palace during the Zhenguan era. Through the mirror, snacks, stuffed toys, and warm winter essentials travel back and forth between two worlds. Touched by Little Sizǐ's innocent and cheerful nature, Xiao Ran grows fond of her and does everything he can to provide her with companionship and care using modern-day supplies. This kindness also reaches the Tang Dynasty's imperial court through the bronze mirror, gradually revealing the mysterious bond to Princess Changle, Empress Zhangsun, and others. With no magical spells or supernatural powers, just an ancient mirror, a heartwarming two-way connection spanning time slowly unfolds.