The sweet love drama "Two Worlds" is adapted from the novel of the same name by "Ji Yue Jiao Jiao". It tells the story of a pair of childhood sweethearts who cannot stay together because of hatred, each changing their identities, working together to solve major cases, and jointly protecting the peace of the area. The eldest daughter of the Yuan family, who was born in a general family, was kidnapped. After waking up, she lost her memory and her temperament changed drastically. In order to escape the marriage, she ran away from home and changed her name to A Yuan. She disguised herself as a man and became a small constable in Qinhe County. At the same time, the nobleman Jing Ci was assassinated on the way to send his sweetheart to marry. After surviving by chance, he also came to Qinhe as a county lieutenant and became A Yuan's colleague, secretly protecting A Yuan. A Yuan is dedicated to punishing evil and ensuring the peace of the people. The tree wants to be quiet but the wind does not stop. Murder cases frequently occur in the small county town. Jing Ci and A Yuan unravel the truth step by step, but they are unable to continue due to many obstacles. Soon, A Yuan discovered that she was not the real eldest daughter of the Yuan family, and Jing Ci was not just a small county lieutenant. As their bizarre life stories are revealed one after another, their relationship faces a severe test. When A-Yuan breaks up with Jing-Ci and marries someone else, another murder case in the capital points directly to A-Yuan, causing her to be imprisoned. In order to save A-Yuan, Jing-Ci, with his weak body, clears away the mystery, finds the mastermind behind the scenes, and takes A-Yuan away from the turmoil.