South Korea's leader Yoon Suk Yeol says comments by Japanese Prime Minister Fumio Kishida that "his heart hurts" for those who suffered under Japan's colonial rule resonated with many South Koreans.

President Yoon made the remark at a meeting with Kishida on the sidelines of the Group of Seven summit in Hiroshima in Japan.

The bilateral meeting on Sunday marks the third between the two leaders this year. Although relations between the two countries had been icy for years, ties have improved since South Korea announced in early March a plan for its companies to compensate forced labour victims.

Ahead of their meeting on Sunday, Yoon and Kishida visited the Hiroshima Memorial Peace Park to pay their respects at a memorial for Korean victims who had perished in the atomic bombings in 1945.

"I feel that our visit was important for both Japan and South Korea relations, as well as for us to pray for world peace," Kishida said to Yoon ahead of the meeting.