According to the forced explanation of the finale, the razor is really from Li Hao, and I forgot it after I used it. The old razor was lost in the process. He shaved with a new razor, so the DNA on it is cheng cheng. The laboratory only selected the samples of Cheng Cheng and gave the correct appraisal report. After re-appraisal, Cheng Cheng was indeed Gao's son.
A Brief Introduction to the Ending of Gao Guangyi's Son;
There is more than one illegitimate child in Gao Guangyi, and there are always two illegitimate children. Another illegitimate child is Lin Lin, the son of housekeeper Lin Huizhen. However, these two illegitimate children have different endings. When they died, the journey narrowly escaped death, while Linlin was buried in the fire.
Jiang Yuanxing and Cheng Cheng returned to the cloister again, setting a trap to lead to the real murderer behind the cloister arson. However, in order to exonerate her mother Lin Huizhen, Lingling tried to destroy the evidence in Jiang Yuanxing's hands, and as a result, she exposed herself. Finally, she had a heart attack and wanted to die with Cheng Cheng. In the end, Lingling died in a fire and Cheng Cheng was seriously injured in hospital.
Finally, it was found that Cheng Cheng was really Gao Guangyi's own son. Although the razor has Li Hao's DNA, it also has Cheng Cheng's DNA. In the end, Cheng Cheng also inherited a 5% stake in Gaos thought, but Cheng Cheng gave it all away.