Police officer Pang Hong Mei amid the many obstacles created by U.S. and Jiang spy agents, rescued Ji Danyang, a patriotic scientist who returned from the United States from the enemy spy. She accompanied Ji Danyang to Lumen City to participate in the "Water Drop Project". Enemy special forces formulated a sabotage plan codenamed "Operation Rock" and concentrated their forces and tried to destroy the "Water Drop Project." Pang Hongmei and Ji Dan Yang fought a life-and-death battle with enemy agents in Lumen, thwarted the enemy's conspiracy, protected the "Water Drop Project" and finally achieved the expected success. The couple who went through the test of life and death, also realized their dreams and firm ideals.