A story about bullies, the bullied, and a new friend -Language warning-

Chae Bin, a 20 year old girl on the verge of being a world wide k-pop star. She's number one on all the charts but one day when she goes back to Seoul to visit her brother during practice, a bad storm hits and she finds herself back in high school, 17 and yet to even let out a debut. But that's not it, then she realizes she wasn't the only one sent back, all of her friends were sent back too but only a few of them remember, but for how long? and what happens when Chae changes the past by confessing to her high school crush?? Will things ever be the same? Or will this be the perfect restart button?