In order to determine the time when the skull was exchanged, Shen Yi found all the students' paintings of the skull. Several of the paintings were dated on the same date as Ren Xiaoxuan's diary. He found that the weather recorded in Ren Xiaoxuan's diary on April Fool's Day was different from the weather at that time.Du Cheng thought that Tian Lin might have remembered it wrong. However, Shen Yi carefully analyzed the effects of light and humidity on painting and concluded that Ren Xiaoxuan's diary was lying, and information about the boy happened to appear in all of these diaries.description of the child.

He Rongyue detected from the skeleton that Ren Xiaoxuan's fatal injury came from the knife in the chest, and no toxic substances were found in Ren Xiaoxuan's skeleton or the nearby soil. However, ingredients of banyan tree flowers and substances that were not belonging to the banyan tree were found in the pelvis of the skeleton.Based on the soil composition of the playground, Du Cheng concluded that the first scene of Ren Xiaoxuan's death was not in the playground.

Du Cheng showed Ren Xiaoxuan's paintings to Shen Yi. There were a lot of banyan trees in the paintings, and one of the paintings with two banyan trees actually retained a red lip mark. Shen Yi accidentally discovered that there was a red lip mark in the painting.There was another lip mark superimposed on it, and then he rubbed out the invisible lip mark. Du Cheng felt that this lip mark was more like a woman's lips.Shen Yi modified the previous portrait according to the structure of the lips, and the character finally displayed in front of him was Qu Lanxin.

After investigating the clues, the police quickly found the two banyan trees in the painting. Forensics and trace personnel found a utility knife buried in the soil between the banyan trees and extracted blood stains from the soil.Qu Lanxin cut off her long hair and stood on the roof of the teaching building. Du Cheng, Shen Yi and others came after hearing the news, and Qu Lanxin proposed to talk to Shen Yi alone.

Shen Yi, who was afraid of heights, walked carefully to Qu Lanxin, and Qu Lanxin told Shen Yi the story of her and Ren Xiaoxuan.Qu Lanxin has liked to cut her hair short and play basketball since she was a child, so she has always been considered an outlier, but she doesn't care.When Ren Xiaoxuan was molested by Zhao Zipeng, it was Qu Lanxin's appearance who saved Ren Xiaoxuan. Since then, Ren Xiaoxuan has become dependent on Qu Lanxin.Ren Xiaoxuan silently guarded Qu Lanxin, and Qu Lanxin also understood Ren Xiaoxuan who was being bullied, and the two accompanied each other like this.After Ren Xiaoxuan transferred to school, the two often met under the banyan tree, but Qu Lanxin gradually discovered that Ren Xiaoxuan's feelings for her were not friendship.Qu Lanxin only looks like a boy on the outside, but she is still a pure girl in her heart. In order to let Ren Xiaoxuan come out of the illusion, Qu Lanxin wears a skirt to meet Ren Xiaoxuan. She hopes that Ren Xiaoxuan can face the friendship between the two.In his sad life, Ren Xiaoxuan's only hope was Qu Lanxin. When Qu Lanxin broke everything, Ren Xiaoxuan also lost the courage to live. She stabbed herself with a utility knife.Qu Lanxin tried to rescue Ren Xiaoxuan but was blocked by Ren Xiaoxuan. Qu Lanxin, who did not dare to report the crime because of fear, buried Ren Xiaoxuan under the banyan tree.A few years later, Qu Lanxin returned to school as a teacher. In order to bring Ren Xiaoxuan closer to her, she moved Ren Xiaoxuan's bones to the playground and the skull to the art room.

Shen Yi persuaded Qu Lanxin to accept trial, and the forensic doctor would examine Ren Xiaoxuan's manner of death, and she would get a fair result. Qu Lanxin was handcuffed, and before leaving, she asked Shen Yi to help her complete the unfinished line drawing.

The anniversary of Lei Yifei's death came, and Du Cheng went to the Beijiang Yacht Club building to mourn him. There were many paintings by Shen Yi on the walls of the Beijiang Yacht Club building, and Lei Yifei's portrait was among them.Lin Min also came here, and Du Cheng remembered that he had seen her next to Shen Yi when he was investigating the murder of Lei Yifei.

After Lei Yifei's case happened, Shen Yi fell into regret. He told Lin Min that he would be the person to change the outcome.Shen Yi burned all his works, and Lin Min wanted to persuade him, but since then Shen Yi disappeared from the art circle without a trace.

The sister of the victim of the marriage fraud and murder case went to the police station to find Director Zhao. Sister Fei wanted to stop her, but Shen Yi happened to pass by. Sister Fei asked him to draw a poster for her. The contents of this poster were all about Shen Yi, and Du Cheng complained.Shen Yi is narcissistic.