The brother of a South Korean missionary imprisoned in North Korea requested U.S. President Joe Biden’s help in getting his loved ones released on Tuesday, as he met a U.S. official in Seoul.

Kim Jong-sam, the brother of the missionary Kim Jong-uk, delivered his message to the president in a handwritten letter that he gave to U.S. deputy special representative for North Korea Jung Pak on Tuesday and shared with NK News.

Along with Kim, Pak also met with Hwang In-cheol, the son of one of the South Korean nationals abducted by North Korea when it hijackeda Korean