News of the Japanese defeat at Hansan Island reached Busan within hours and two Japanese commanders, Kuki Yoshitaka and Kato Yoshiaki, immediately set sail with 42 ships for the port of Angolpo, where they hoped to face the Korean fleet close to shore.

Yi Sun-sin received news of their movements on 15 August and he advanced towards Angolpo to confront them. This time the Japanese were unwilling to follow the Koreans into open water and stayed onshore. They would not take the bait. In response the Korean fleet moved forwards and bombarded the anchored Japanese fleet for hours until they retreated inland. Later the Japanese returned and escaped on small boats. Both Kuki and Kato survived the battle.

The battles of Hansan Island and Angolpo forced Hideyoshi to give a direct order to his naval commanders to cease all unnecessary naval operations and limit activity to the immediate area around Pusan Harbor. He told his commanders that he would come to Korea personally to lead the naval forces himself, but Hideyoshi was never able to carry through on this as his health was deteriorating rapidly. This meant that all the fighting would be in Korea, not China, and that Pyongyang would be the furthest northwestern advance of the Japanese armies (to be sure, Katō Kiyomasa's second contingent's brief march into Manchuria was Japan's northernmost advance, however, Manchuria was not a part of Imperial China in the 16th century). While Hideyoshi was unlikely to be able to invade China and conquer a large part of it, the battles of Hansan Island and Angolpo checked his supply routes and hindered his movements in Korea.