Yan Xi, a modern woman who has closed her heart due to emotional injuries, once traveled to the late Eastern Han Dynasty and accidentally entered Zhao Yun's world. She is smart and courageous, while he is affectionate and forbearing. The two get to know each other and cherish each other in the flames of war, but in the end they are no match for the barrier of inner trauma. When she chose to cut off everything and return to modern times, Zhao Yun stayed alone in the palace, leaving only "A Xi" in his mouth, which became a name he could never call out again for the rest of his life. Not being able to love is also a regret in his life.