According to the investigation, there was a rare orchid in Li Guofeng's home, which disappeared after the accident. After reorganizing the case, his friend Wu Xun was listed as the key suspect. In order to get the orchid, he pushed Li Guofeng back after being held by two people, tied him to the solar energy on the roof, and then killed him. Later, he created a perfect alibi to escape his guilt. Fortunately, his fingerprints were found near the body and he was brought to justice.