Do Shiyoon was the leader of a struggling K-pop boy band when he tragically died in a car accident... or so he thought! Miraculously, he wakes up in his 17-year-old body and realizes that he's gone back in time to before he debuted as an idol. Now, he is determined to make it big in K-pop. As he prepares for his re-debut, he has to avoid the pitfalls of his first life while gathering four like-minded and talented idol trainees to make a new boy band, the likes of which K-pop has never seen!