Vanishing Time: A Boy Who Returned

Following the sudden loss of her mother, Su-rin moves to a remote island with her step-father, where she meets and befriends an orphan boy named Sung-min. One day, while the two are investigating a cave high atop a mountain, they find a glittering egg, which according to folktale, holds the power to instantly transform a child into an adult.

Even though Su-rin tries to stop him, Sung-min takes the egg out of curiosity. When Su-rin goes to exit the cave, she discovers Sung-min has suddenly disappeared. The police begin an abduction investigation despite Su-rin's protestations. A few days later, a man in his 30s appears and claims to be the adult Sung-min.

Korean w/ English subtitles.