A working class family wins a free vacation to Hawaii. But when their plane takes flight, it gets hijacked by terrorists. To save her family and the other passengers, the wife must reveal her secret past and fight back.

Along with his young son, Ji-ho, Woo-jin misses his wife Soo-a, who died after promising to return a year later with the rainy season. Miraculously, they reunite with Soo-a when the rainy season comes around, but she has no memory of her husband and son whom she dearly loved.

A gym teacher and his female student look for her missing friend. But as they investigate, they find that her disappearance is a part of a larger conspiracy.