"Crash Landing On You" did tease that Gu Seung Jung's character wasn't going to have a happy ending most likely and it turned out to be true. At the beginning of the last episode, his character dies in Seo Dan's arms, but not before confirming that Seo Dan was indeed in love with him.
After 16 thrilling and emotional episodes, Crash Landing on You ends with a bang, giving us a happy ending for most of our characters but some sadder conclusions for others. The show has managed to build to this finale brilliantly whilst making sure we find out everyone's fate in the epilogue.
The story revolves around a successful South Korean businesswoman who, while paragliding near Seoul, finds herself caught in a sudden storm. Consequently, she crash-lands in the North Korean portion of the Demilitarized Zone (DMZ).
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crash landing on you explained