You are Kim Eunnie, and you and your best friend , Song Min Ji, are schooling at SMTOP High. During the holidays, you and Min Ji went to an island called Jeju-do for a school exchange programme. For that, both of you were team/room mates with L.Joe, Taemin, Onew, Ricky and some others. During the programme, you went to the  forbidden forest with your team/room mates without the teacher's permission. That day, all of you went to a certain part of the forest and saw a yellow, tall and huge robot lying on the ground, and you and your friends dangerous adventure starts...........................................................................................................................