TVXQ and Super Junior are treated to a luxury holiday by SM Entertainment in Bali, Indonesia. However, when they return to their rooms after dinner, they find that their belongings have been taken and they've been left with a backpack each. Their company has "transported" them back in time to 2002 when they were trainees; they have limited money, analog cameras and MP3s filled with songs from 2002 and before, old mobile phones, and a guitar. To "return" to 2019, they must go around Yogyakarta with their limited funds, and go on different tourist trips, taking photos and experiencing Indonesia whilst becoming closer together and strengthening their bond.

NCT 127 embarks on a trip to the beautiful and mysterious island of Somuuido. But their excitement of the picturesque scenery doesn't last long. They are stranded alone, and the island holds a huge secret. With the help of an old journal left by a ship captain, they have to find five treasures within 72 hours to escape. Will NCT 127 be able to escape successfully?