1, "coward" Qin is his younger brother Qin Tian. While chatting with his brother, Qin Li realized that his brother might have killed Huang Shu, and he still had a chance to commit another crime. In order to investigate the truth, Qin Li tied up his brother.

2. The death of Huang Shu is Qin Li's heart disease. In order to find out the truth, Qin Li has been looking for the murderer.

Qin Li chatted with his brother and found something suspicious. When he came back for something, Qin Li trapped his brother.

Coward is adapted from Zheng Zhiyuan's novel Raw Swallow. It will take the ten-year life changes of four teenagers as the main axis of the story, take two highly similar murders across time and space as clues, and see people's hearts and witness courage through the process of solving puzzles.