"Forever young?" I lifted my pinkie finger in front of us. He smiled, and intertwined his pinkie finger to mine. "Young forever."

Kim Sohyun, will disguise as a personal assistant of her brother's boy group called BTS, She will fall in love with someone from the members and make new friends. She will encounter her baddest bully in highschool, Jennie Kim. Until now, Jennie had never showed an act of tolerance to her, she even made Sohyun's life miserable, and she was pushing her into the flames of harsh circumstances. With the two girls behind Jennie's back-Rosé and Jisoo will do their utmost to help-just to make Sohyun down. How would she steer clear of the cameras surrounding her? What should she do to escape from Jennie's cruel doings? How would Sohyun conceal her identity in the midst of these miseries?