SBS (KR) - 30 mins - TheTVDB, IMDB
Hae Sung, played by Yeo Jin Goo, disappears after a mysterious accident. 12 years later, he appears again all of a sudden. He is now 31 years old, but he still has the appearance and personality of himself at age 19 when he disappeared. Hae Sung gets romantically involved with Jung Won, played by Lee Yeon Hee, who is his childhood friend.