Zhang Lin dressed up as Erya, her three-year-old adopted sister who died young. After waking up, she used her keen investigative skills to infer that Erya did not accidentally fall off the cliff, but was deliberately pushed down the mountain by her cousin Zhang Yuzhen. After Zhang Lin woke up, Zhang Lin's grandfather Zhang Yaowen, grandmother Chen Yuwei, and father Zhang Guosheng unexpectedly discovered that they could hear Zhang Lin's voice. Through her voice, they saw clearly the true face of Zhang Yuzhen, who appeared to be well-behaved but was actually vicious.
