2018, Binchuan City.A bizarre accident knocked open the stone lion statue in Penglai Plaza owned by Penglai Group, revealing the old bones inside.Police quickly identified the person who hit the car, but the motive for the crash remains under investigation.The orphan Gao Feng is obsessed with mountain climbing and hiking, and spends eight months of the year away from home.Unexpectedly, when he returned on foot, he heard the news of the death of his adoptive father Gao Dahua.The adoptive mother said that Gao Dahua died of illness, but Gao Feng didn't believe it.Su Min of the Municipal Economic Investigation Detachment is Gao Dahua's godson. Gao Feng went to him to ask about the cause of Gao Dahua's death, but Su Min only said that he had ruled out a criminal case.

Gao Feng went home again to question his adoptive mother, and finally learned that Gao Dahua could not bear the pain and ended his life by drinking paraquat one night.Over the years, Gao Feng has not had a good relationship with his adoptive father, Gao Dahua.Gao Feng is obsessed with finding his roots and his biological parents. For this reason, he also wants to enter the police academy and become a policeman. However, Gao Dahua strictly prohibits him from entering the police academy and becoming a policeman.Gao Feng knew that his adoptive father knew about his biological mother, but kept concealing it. This became a thorn in Gao Feng's heart. For this reason, Gao Feng complained and hated his adoptive father Gao Dahua for many years, and even stayed away from home for a long time after he became an adult.

The secret of his life experience has become even more difficult to trace with the death of Gao Dahua.Even Su Min said that he was gone and things should change.But Gao Feng always remembered a tune that he was sure was sung by his biological mother. As he grew older, the tune became clearer and clearer in his mind, as if urging him to pursue and find it.One night, a woman took a taxi and came to the building where he rented a house. She said "Gao Dahua did not die of illness" and left.Gao Feng recalled that when he returned from looking for Sumin and heard his adoptive mother's words, he became more and more certain that Gao Dahua did not die of illness and that everyone was hiding something from him.

Gao Feng secretly set up surveillance cameras in front of the memorial platform and found that Dongzi was sneaking around and uneasy among all the people who came to express condolences. He went directly to Dongzi to ask the reason and learned that he had taken Gao Dahua to Songjiang Garden on the day the old bones were found in the stone lion statue on Monday.Gao Feng used a method to lure out the people Gao Dahua met in Songjiang Garden, but failed to achieve his goal.Later, in front of Su Min, the adoptive mother said that Gao Dahua had a mistress outside and was defrauded of 100,000 yuan.Gao Fengru didn't believe it no matter what. Gao Dahua had been working on the stove all his life. How could someone like him raise a mistress outside?

Gao Feng determined that this woman was not a mistress, but his biological mother. Gao Dahua must have given the 100,000 yuan from the final chemotherapy to his biological mother.Hearing this, the angry adoptive mother slapped Gao Feng, and finally blushed to calm down.The wake was coming to an end and Gao Feng wanted to say a few words to his adoptive father alone, but his adoptive mother went out without saying a word.Although Gao Feng had never called Gao Dahua dad since he was a child, the kindness of raising him was unforgettable.Gao Feng didn't seem to care about anything, but he was deeply saddened by his adoptive father's death. He wanted to call Gao Dahua "Dad" in front of everyone, but he couldn't.

After Gao Dahua was buried, Gao Feng continued to investigate and found that a taxi had been parked in Songjiang Garden, which was very unusual.He asked Dongzi to chase the car, but when he caught up in the rain, he discovered that the mysterious passenger in the car had already got off the car. The driver took the money and refused to tell the passenger's appearance. He only gave him a box of cakes and asked him to go to the stone lion statue in Penglai Square.