The secret of the bottom of the lake can be found in chapter 121 of the novel.

According to the documents provided, the secret of the bottom of Taiping Courtyard in << Celebrating Years >> could be found in chapter 121.
In the novel Joy of Life, the secret at the bottom of the lake referred to the story of Ye Qingmei and the temple, which appeared in chapter 139 of the novel.
The secret of the bottom of Joy of Life could be found in the 121st chapter of Joy of Life.
Joy of Life's secret at the bottom of the lake was revealed in chapter 121 of the novel.
The secret of the bottom of Taiping Courtyard in the original novel Joy of Life could be found in chapter 121.
The secret of the bottom of Taiping Courtyard in the original novel Joy of Life could be found in chapter 121.
The secret of the bottom of Taiping Courtyard's lake could be found in the 121st chapter of Joy of Life.
In Joy of Life's novel, the secret at the bottom of Taiping Courtyard's lake was the Forbidden Door. According to the contents of Ye Qingmei's letter to Fan Xian, there was a forbidden door at the bottom of the lake. This door was believed to be the final location of all secrets. The Forbidden Door was related to Fan Xian's identity in this world. It involved the story of Fan Xian's illness in his previous life and his spirit " traveling " to Ye Qingmei's childhood.
The secret of the bottom of Taiping Courtyard in the original novel Joy of Life could be found in chapter 121.
In Joy of Life's novel, the secret at the bottom of Taiping Courtyard's lake was the Forbidden Door. According to what Ye Qingmei had mentioned in her letter to Fan Xian, there was a forbidden door hidden at the bottom of the lake. It was also the final location of all secrets. The specific contents of the Forbidden Door were still unclear, but it might involve modern high-tech equipment such as mobile phones, navigation, computers, and so on. Fan Xian might open this door and enter the hidden door. There might be many terrifying things inside the hidden door, and many truths were hidden. Ye Qingmei also mentioned that opening this secret door required one to be prepared to face the abyss at any time. Once it was opened, Fan Xian's life would undergo a tremendous change. In short, the secret at the bottom of Taiping Courtyard's lake might involve Fan Xian's life and fate, as well as the truth of Ye Qingmei's experiments and seeds.