Wait did jungwoo go missing when he was a child due to a plane crash? I'm so confused

Ohh wait I realized it's just made up cuz it's a side story where jungwoo and youngmin don't know each other and just meet in the island.
Jungwoo is like Tom hanks from cast away

It’s a side story so it’s not related to the original plot (I think)

U r ryt