Pei Su fell into a dream again, the same as last time, he saw himself as a child and the burning piece of paper.The difference is that this time he also saw his mother's body, and Xiao Peisu stood beside him, tears falling.A pair of big hands covered his eyes, which was Team Luo's hand.Pei Su woke up from his dream and found that he was asleep listening to the recording of the cleaner.At this time, Team Luo was also listening to the recording and pondering the words in it.Suddenly, Tao Ze's phone call interrupted his thoughts. A student from Pingshao Middle School in Panlong Mountain, Beizhou was robbed while traveling. Afterwards, a female student named Qu Tong disappeared.

Team Luo quickly rushed to the scene and found that Pei Su and Zhou Hongchuan were also there.Zhou Hongchuan explained that the racing club he organized happened to be active in Panlong Mountain that day. After learning that someone was missing, he organized everyone to search together.Soon, Qu Tong's footprints were found on a path. Because it was drizzling at that time, the footprints were extremely clear.Team Luo looked at the footprints and a scene appeared in his mind: someone was following Qu Tong, and she was helped up after she fell.

Qu Tong's father Lao Qu sent a mysterious recording, and the sound of bells appeared in the recording, which reminded Team Luo of the old case of Lianhua Mountain 16 years ago.At that time, Lao Guo, the father of the sixth victim, also received a call with only a bell.Qu Tong was wearing a floral skirt when he disappeared, similar to the girl in the missing case that year. Team Luo decided to investigate the case together.

Although Wu Guangchang, the murderer of that case, has been arrested, Team Luo suspects that the real murderer may be an uncaught empathetic.Team leader Du agreed to his request.At the same time, a girl wearing a floral skirt, Chenchen met a strange old man while waiting for the bus and ran away in fear.While running away, she bumped into a beautiful sister, and the old man had disappeared when she turned around.

Team Luo found Lao Guo again, told him about the recent disappearance, and mentioned the bell sound in the recording.Team Luo asked Lao Guo, who other than the police, knew this details and how he discovered Wu Guangchang.Lao Guo revealed that he had followed the suspected vehicle to the garbage disposal station, and about the bell, he told his daughter's head teacher that several sanitation workers were also present at the time.He found out that Wu Guangchang met a little boy during the investigation. The little boy said that his classmate was lost. Later, he received a call from the little boy saying that he saw Wu Guangchang dragging the girl into the house. He rushed to Wu's house and saw him identify Wu Guang.Chang's girl stabbed Wu Guangchang in desperation.

After investigation, the boy was named Xu Dongyu, and he is now a photographer.The last survivor, Su Lingnai, is no longer alive.Team Luo found Xu Dongyu and asked about the situation that year, but Xu Dongyu said that he had lost a lot of memories due to illness.Team Luo found that Xu Dongyu seemed to have known about Su Lingnai's death for a long time, so he decided to send someone to follow him.