Senior diplomats from Korea and Japan held a second round of talks in Tokyo on Thursday on Japan's sexual enslavement of Korean women during World War Two.
But progress appears to have been slow.
Seoul's foreign ministry said the two sides held an in-depth discussion on ways to resolve the so-called comfort women issue.
More than 200-thousand women, mostly Korean, were forced to serve as sex slaves to the Japanese military at so-called "comfort stations" in the early 20th century.
Tokyo claims the issue was settled through a 1965 treaty when the two countries normalized diplomatic ties, but Seoul is demanding an official apology from Japan and legal compensation for the victims.
The next meeting will take place in Seoul in June.