Southern Territory Aviation's final release engineer, Gu Yan, signed the Yunxian 917 release order under pressure from operations vice president Lu Cheng'an. The aircraft lost contact on an ocean-crossing flight and crashed into the sea, with 247 people killed. He was suspended, shouldered the blame, and faced cyberbullying. Opening his eyes, he returned to twenty minutes before signing. This time, he tore up the release order, locked down the boarding bridge, and braving the online abuse, investigated communication anomalies step by step, along with cargo hold temperature control and that concealed scientific research exhibition equipment. Full-aircraft simulation confirmed that taking off as originally planned would result in a loss of contact in the seventh hour. The aircraft was grounded and sealed, and 247 names were all safe.