Xing Yuan Yang, Zheng Jia Bo and “My fair lady” met each other in a music camp during high school. They had similar interests and aspirations, thus they cherished each other. They founded a club in school and set up a band named “London Bridge Band”. When the club became more and more impressive, Xing Yuan Yang announced to quit the club suddenly. This act had planted the seeds of the “London Bridge is Falling Down” event.
After years, as fate would have it, their descendants, Xing Xing, Mu Lin Sen and Xia Tong Yao came to know each other through the nursery rhyme club and the song London Bridge is Falling Down. As Zheng Jia Bo left a statement of “My fair lady, I had buried a secret under the London Bridge”, three of them tried to figure out the truth behind the fallen Lon-don Bridge. At first, they only wanted to find out the secret. However, as time passed, their relationship deepened and they managed to share the weal and woe together. The process of finding truth was full of difficulties. Like peeling an onion, they removed the surface of the “London Bridge” mystery, approaching the core, but no one knew that when the truth could be reached in one step, the bridge was again facing an imminent collapse...