Little Prince Li Chengjing, unvalued by the emperor, single-mindedly stays away from court disputes, seeking only to live in peace. Hidden Guard A Si, lurking by his side, is usually grinning and seemingly casual and unrestrained. The storm of imperial succession sweeps the court; the crown prince views Li Chengjing as a threat, setting layers of traps and repeatedly cornering him. At critical moments, A Si tears off his disguise, stepping forward multiple times to protect his safety. Ambushes in dense forests and calculations in deep palaces, crises follow one after another. Amidst the court, everyone harbors their own thoughts and flatters the powerful. Only A Si fears no danger, swearing to follow to the death. The two join hands to crack heavy conspiracies, striving to find a ray of life in the undercurrent-churning court chess game.