9 girls with the same dream but different personalities had been gathered by their principal. He was planning to debut them in a girl group name Twice. However due to their different personalities, they cannot seems to get along well. Furthermore, most of them are not ready to debut. Therefore, the deal has once again been turned down. The 9 girls were sent to a special class and were personally trained by their principalas he saw a big potential in them. For the past few years, they were given lessons on singing, dancing and . Overall, it was hard but they soon started to develop feelings for each other...