Metro Broadcast, Hong Kong on 1044 kHz was a relatively easy catch on the early morning hours in Seoul. When I heard them in 1991, they were an English language talk station. Now the station broadcasts in Chinese and other languages and the channel is called Metro Plus.
They sent the QSL letter seen below.
Radio Television Hong Kong (RTHK) Radio 6 can be heard in Seoul in the early morning hours. When I heard them in 1992, they were relaying BBC World Service. They currently broadcast Cantonese and Mandarin language programming from China National Radio (CNR). Their transmitter is located in Peng Chau.
They sent this QSL card for my reception report.