Who killed Xia Bingqian?

In the TV series Echo, Wu Wenchao was entrusted by Xu Haitao to try to keep Xia Bingqing away from Xu Shanchuan, so Wu Wenchao asked Qing Liu to immigrate for Xia Bingqing and Qing Liu gave it to Yi Chunyang. Unexpectedly, there was a contradiction between the two sides because of the payment problem. In the end, Yi Chunyang killed Xia Bingqing in a rage.

The online drama Echo is adapted from the novel of the same name by the writer Dongxi. The novel tells the story that the heroine Ran Dongdong accidentally found the clue that her husband opened the house privately in the process of solving the murder case, so she had to solve the case and solve the emotional mystery, and the psychological contest on two lines began at the same time.