In the middle of the Republic of China, wars raged and national treasures were lost seriously. Su Yuwan, a famous Kunqu Opera actor, carries a map of national treasure passed down from her ancestors. She uses the stage as a shield to hide the great interests of her family and country. During a performance, she met Shen Tingyuan, a patriotic officer responsible for protecting cultural relics. The two became attached to the national treasure and fell in love with each other in the turmoil. The traitorous businessman Zhao Heting colluded with foreign invaders, coveted the map, and repeatedly set up traps to pursue him. Su Yuwan used Kunqu opera lyrics to deliver a secret message, and Shen Tingyuan used his military strength to guard it. The two worked hand in hand to deal with the enemy in troubled times. After going through the test of life and death, they finally succeeded in handing over the national treasure to the country, using their meager efforts to protect the cultural heritage of the mountains and rivers.
