I Rely on Solving Cases to Make a Living.

Summary

The telephone switchboard of the 1950s operated manually, requiring cranking and operator assistance for calls, making eavesdropping easy. Wo Da Han avoided discussing sensitive matters over the phone, opting for dead letterboxes or face-to-face meetings. Chang Wei analyzed Wo Da Han's call records, identifying suspicious midnight calls, and deduced their purpose. He proposed promoting Guo Bai Jun to deputy chief designer to lure out spies. After securing the minister's support, they set up a listening device to monitor calls. The plan unfolded as the phone rang, indicating a possible contact with Wo Da Han, leading to a critical exchange about sensitive information.

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