The incident starts with the death of two North Korean soldiers in the DMZ (As part of the
Cease-fire Agreement that ended the Korea War in 1953, a 4km-wide Demilitarized Zone
(DMZ) was created to act as a buffer between the North and South). At a North Korean
border house, before Sergeant Lee Soohyeok, a South Korean soldier on border duties,
attempts to escape back to the South Korean side and kills two North Korean soldiers.
The southern troops rescue him while the gunfire erupts and, two days later, the fragile
relationship between the two Koreas depends on a special investigation conducted by
Swiss military officer Major Sophie Jang on behalf of the Neutral Nations Supervisory
Commission.
Sophie investigates why the two Koreas have
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The North Korean survivor Sergeant
Oh Kyeongpil states that Soohyeok deliberately crossed the border house and started a
shooting before retreating when the wounded Kyeongpil returned fire.
As Sophie Jang's investigation develops, she uncovers evidence suggesting that neither
two possible scenarios are correct, such as how the number of bullets recovered at the
crime scene are contradictory with the number fired by Lee Soohyeok. With the use of
extended retrospections, the truth about the incident, as well as the unlikely connection
between sergeants Lee and Oh, little by little comes to light, revealing a tragedy borne of
a divided country.
Eventually, Sophie is removed from the case when it's discovered that her father, a former
POW (Prisoners of War), had North Korean ties during the Korean War. Therefore,
technically making her a non-neutral. Before leaving, she attempts to informally learn of
the true events first with Kyeongpil and then Soohyeok. Sophie gives Soohyeok the lighter
he first gave to Kyeongpil. Before saying goodbye and wishing him well, she uncovers
that Kyeongpil told her that he saw Soohyeok's gun actually shot Woojin, the