Liu Xiangxiang, trapped in a dream, is tasked with assassinating Prince Mu Chunshen in the Kingdom of Chu, with four chances before facing death by poison. Disguising herself in various roles within the prince's mansion, her attempts are repeatedly thwarted by unforeseen events. As she gets closer to Mu Chunshen, she discovers his kindness and falls in love, while uncovering the hidden truth behind her assassination mission.
In a mix of historical and modern times, high school student Eun Ho is drawn into the past, where he forms a deep bond with the exiled Crown Prince Lee Heon, who faces constant danger.