The Emperor fakes a severe illness to test his princes. The four princes see through their imperial father's intentions and collectively fake illness to evade the position of crown prince. Taking turns ruling on behalf of the state, the four display their talents, yet attract court officials to scramble and take sides. After the Emperor's faked illness is exposed, he unlocks the psychological shackles of past struggles for the throne, appoints the crown prince, and decentralizes power through institutions. Father and son cast aside suspicions and jointly manage the state and family affairs together, making it a palace story combining political intrigue and wit.