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In a conversation with an old classmate, Lin Xiaoque learned that Xue Wei, the class monitor at that time, suffered from schizophrenia but refused treatment. He often thought he was his deceased classmate Chu Nanxi. That night, another classmate Jiang Baiyao came to visit and made an appointment to visit Xue Wei. Lin Xiaoque was surprised to find that the handsome young man back then was now behaving vulgarly and cynically. Back then, Xue Wei enlisted his classmates to isolate Chu Nanxi because he was jealous of Chu Nanxi's excellence; Lin Xiaoque, as Chu Nanxi's best friend, did not lend a helping hand out of fear; Jiang Boyao was implicated for helping Chu Nanxi. A few years ago, Jiang Boyao bid for a construction project. Party A was Chu Nanxi's husband. Jiang Boyao interceded with Chu Nanxi in private, but he had a car accident while driving, resulting in the death of Chu Nanxi and his wife. After Chu Nanxi's death, Lin Xiaoque, Xue Wei and Jiang Boyao, who could not express their guilt, fell into deep self-blame. After Xue Wei fell ill, Chu Nanxi's mother gave her daughter's diary to Lin Xiaoque. It turned out that Chu Nanxi had already forgiven everyone. Lin Xiaoque finally got out of his memories and decided to live hard with Chu Nanxi's dream; Xue Wei entered a mental hospital and actively received treatment while repenting for his past behavior; Jiang Boyao adopted Chu Nanxi's daughter, changed his decadent state, and regained his pride as an architect.

He, a doctor of psychology, encountered "not doing his job properly" and opened a coffee shop called "Jian" on the street of Yuyuan Road in Shanghai. In addition to selling coffee and snacks, he also encouraged customers to write down their thoughts in letters. He Yu uses his professional knowledge to relieve customers' worries. In the process of helping customers with He Yu, several clerks in the cafe also began to reveal their feelings and talk about the past. It turns out that they are all He Yu's former patients, and each of them has a past that cannot be shaken off. He Yu accompanies them to overcome the trauma and face life with a smile. And He Yu also has his own knot. He was abandoned by his biological mother due to a brain disease when he was born. Congenital brain disease also destined He Yu to not have a long life. He founded the "Jian" cafe partly because he wanted to find his biological mother before the end of his life. At the end of the novel, He encounters an illness and dies. The people who were cured in the "Jian" cafe continue to run "Jian" with the memory of him, hoping to warm more people in the future.