On January 30, Lim traveled to North Korea from China with a companion from the church who last spoke with him the following day, on January 31.
Lim was scheduled to return on February 4 from what was described as a “routine” trip to Rajin, located northeast in the country, where his church supports a nursery, orphanage and nursing home, according to the Light Korean Presbyterian Church.
However, so far he has failed to show.
Aijalon Mahli Gomes, a U.S. citizen sentenced to eight years of hard labor and believed to be a Christian activist, was released from North Korea in 2010 after a visit to Pyongyang by former U.S. president Jimmy Carter.
CNN’s KJ Kwon contributed to this report from Seoul, South Korea.