According to South Korea's spy agency, Jo Song Gil and his wife went into hiding in November. A defection would embarrass leader Kim Jong Un.
Kim Jong Un sends a letter to Moon Jae-in calling for more peace discussions between the leaders following their active engagement in 2018.
A flurry of agreements generates unease in Washington over the speed of engagement between the longtime rivals.
The Democrats aren't the resistance. Their midterm wins are only a tool in our resistance kit, and understanding this is imperative to our future.
The joint effort suggests diplomacy has resumed after weeks of stalemated negotiations between Seoul and Pyongyang.
South Korean President Moon Jae-in says his North Korean counterpart is eager for another summit with President Trump and also wants the U.S. secretary of state to visit Pyongyang soon for nuclear talks.
The leaders of North and South Korea reach a summit agreement with many tantalizing offers, but Kim's premier pledge on denuclearization contains a big condition.
South Korean President Moon Jae-in says that to defuse crises and prevent accidental clashes, the Koreas have agreed to establish a committee to evaluate how to reduce tensions and maintain communication.
The North Korean leader and the South Korean president arrive in Pyongyang, where they are expected to have talks over lunch.
The North celebrates with a major military parade and a revival of its iconic mass games. In keeping with leader Kim Jong Un's new policies, the emphasis is firmly on economic development.