On 7 June 1950, Kim Il-sung called for a Korea-wide election on 5–8 August 1950 and a consultative conference in Haeju on 15–17 June 1950. On 11 June, the North sent three diplomats to the South, as a peace overture that Rhee rejected. On 21 June, Kim Il-Sung revised his war plan to involve general attack across the 38th parallel, rather than a limited operation in the Ongjin peninsula. Kim was concerned that <answer>South Korean agents had learned about the plans</answer> and South Korean forces were strengthening their defenses. Stalin agreed to this change of plan.
Why did Kim's war plan need revising?
South Korean agents had learned about the plans