HLKT is the Munhwa Broadcasting Corporation outlet for Daegu (Taegu), South Korea. The frequency of 810 kHz in South Korea is tough because of interference from the co-channel North Korean Korean Central Broadcasting System station and the South Korean jamming. AFN in Tokyo, Japan is also problematic. I managed to hear them one morning in Gunsan (Kunsan) when things are quiet. They replied with this QSL card for my reception report.
The Korean text on the card translates to “Thank you very much for your reception report. As a result of confirmation without error, we send you a verification of reception.”