South Korean National Intelligence Service Director Suh Hoon met his North Korean counterpart Jang Kum-chol, head of the North's United Front Department (UFD), the Yonhap News Agency said, citing a government source. During the meeting, Suh said that he hoped for better inter-Korean ties.
The sides, however, did not discuss the summit, the source added.
The second round of denuclearization talks between Trump and Kim concluded in Hanoi in late February. Though the meeting started on a high note, it ended abruptly, with no deal.
At the time, the US president said that since North Korea was not willing to denuclearize the specific areas that Washington wanted while seeking full sanctions removal, it was not appropriate to sign an agreement at that point.
Over the last weeks, North Korea has conducted several launches of unidentified projectiles. Both South Korea and the United States believe that Pyongyang has recently been testing short-range missiles, while North Korea said it tested new multiple rocket launchers. The UN Security Council banned North Korea from developing its ballistic missile program.
The tests come amid an escalation of tension on the Korean Peninsula. While North Korea has been opposing the annual US-South Korean drills, last week, Pyongyang warned that Seoul would pay a price for holding them.
Meanwhile, Trump said he received a letter from Kim, in which the North Korean leader said he was not happy with the US-South Korean exercise.