North Korea

Ten minutes after takeoff from Kangnung Airport, a passenger came into the cockpit and forced the pilots to divert to North Korea. After crossing the border between both Koreas, the airplane was escorted by three fighters and the crew was forced to land at Sondok Airport near Wonsan. Apparently, the landing was 'missed' and the airplane was severely damaged upon arrival. Nevertheless, none of the 52 occupants were injured but arrested and interned by the North Korean Authorities. Following negotiations with South Korea, 39 passengers were released and sent back to South Korea on 14 February 1970. But all four crew members and nine passengers plus the hijacker were not released. In 2018, the South Korean Government and the families still do not have any information about the fate of these 12 people listed here below:
Yu Byeong-ha (유병하, 38), pilot,
Choe Seok-man (최석만, 37), copilot,
Jeong Gyeong-suk (정경숙, 24), stewardess,
Seong Gyeong-hui (성경희, 23), stewardess,
Yi Dong-gi (이동기, 49), Director of a printing house,
Hwang Won (황원, 32), Director of the Munhwa audiovisual company,
Gim Bongju (김봉주, 27), cameraman for Munhwa audiovisual company,
Chae Heon-deok (채헌덕, 37), doctor,
Im Cheol-su (임철수, 49), office employee,
Jang Ki-yeong (장기영, 40), businessman in the food industry,
Choe Jeong-ung (최정웅, 28), employee for Hankook Slate.

While performing a night intruder mission between Sinanju and Pyongyang, the airplane was apparently shot down by enemy fire and crashed, killing all four crew members.
Crew:
1st Lt Fred F. Atkinson Jr.,
A1c Howard L. Croshaw,
Cpt Stanley B. Haladyna,
A3c Glen F. Story.

Last radio contact at 0032LT. The aircraft was shot down by enemy antiaircraft fire and crashed. Three crew members bailed out while the fourth was killed.
Crew:
Cpt Jack V. Allen, †
A1c B. M. Conner,
1st Lt R. W. Killeson,
1st Lt C. R. Lebrun.

Crashed in unknown circumstances while completing a night intruder mission.

Shot down by enemy antiaircraft fire. After the right engine was hit in flight and caught fire, the aircraft dove into the ground and crashed. It appears that two crew members bailed out while two others were killed.
Crew:
A1c Jerome Karpowicz, †
Cpt Raymond W. Quesnell,
1st Lt Clifford G. Selman, †
Cpt John E. Walseth Jr.

While flying along the east coast of North Korea during a night mission, the Invader was shot down by enemy antiaircraft fire and crashed, killing all three crew members.
Crew:
Cpt Kenneth L. Doolittle,
1st Lt Roger C. Hall Sr.,
A2c Gerald Jones.

Last radio contact at 2230LT on March 31. The twin engine aircraft was shot down during the night by enemy antiaircraft fire and crashed in a paddy field. No trace of the four members was found.
Crew:
Col Sherman R. Beaty,
1st Lt Lloyd P. Bowman,
A1c Charles A. Lambert,
Maj Harold J. Titus.

Immediately after liftoff, while climbing, the crew declared an emergency when control was lost. The aircraft crashed and was destroyed. The captain was rescued while both other occupants were killed.
Crew:
Cpt Francis S. Bond,
A2c Ronald J. Foglietta, †
1st Lt Charles P. Jackson. †

Last radio contact at 0235LT while on a night reconnaissance mission. No trace of the aircraft nor the crew was found.
Crew:
Cpt Gene A. Culbertson,
1st Lt Alfred H. King,
A1c Robert R. St Mary.

Crashed in unknown circumstances while on a night intruder mission. All three crew members lost without trace.
Crew:
A2c Charles F. Brekke,
Cpt Francis Carmody,
Cpt Aaron Shapiro.