Password of Ruqin Lakeside

In the summer of 2023, Lu Qingyang, a 16-year-old tea-picking boy, found a diary soaked by rain in the Yunwu Tea Garden under the Wulao Peak in Lushan Mountain. The owner of the diary is Cheng Moyun, a female student who was recuperating in Lushan forty years ago. It records her unfinished love story with a young military officer. As the reading progressed, Lu Qingyang discovered that the "Meilu Courtyard" mentioned in the diary was the old building complex that was about to be demolished. At the same time, Hong Kong developer Xiao Yuantu is planning to build a resort here. While Lu Qingyang was tidying up the tea garden, he unexpectedly met Cheng Xue (later confirmed to be Cheng Moyun's granddaughter), a music conservatory student who came to Lushan Mountain to collect music. The two decided to join forces to find the "secret hidden in the sound of the piano" mentioned in the diary. Their actions attracted the attention of Lu Yuanshan, an old tea farmer in Lushan. This seemingly ordinary old man is actually a descendant of the guardian of Mount Lu. Under his guidance, the two young men followed the clues in the diary and found the iron box buried by Cheng Moyun on the bank of Ruqin Lake, which contained a list of important cultural relics from the Anti-Japanese War period. At this time, Xiao Yuantu's men had already targeted them. While evading pursuit, Lu Qingyang took Cheng Xue and fled along the secret trail of tea pickers to Bailudong Academy, where they met Huang Shigong, a professor who studies local history. By deciphering the code in the iron box, they discovered that these cultural relics were hidden in the basement of Meilu Villa. The climax occurs on a rainy night. Lu Qingyang led the villagers to deal with the people sent by the developer, while Cheng Xue took the risk and sneaked into the courtyard that was about to be demolished. At the most critical moment, Lu Yuanshan appeared with the guardian's token and stopped the attempted demolition.