Baek Ah Reum is a typical, ordinary 16-year-old girl with big dreams. She wishes to be a singer who inspires many others to chase their dreams, as cliché as that sounds. She decides to audition for Pledis Entertainment and manages to get through. Other than being a trainee, Ah Reum is a part-time waiter at a restaurant to support her mother and younger sister. When the other trainees found out she was poor, they started bullying and teasing her as they all came from wealthy families. Ah Reum slowly realises that there is much more to being a trainee than just dancing and singing. She keeps it all a secret from her mother, not wanting her to worry. She perseveres to debut quickly but a girl can only take so much before she crumbles. Willl Ah Reum be able to cope with the stress that comes with debuting or will she quit? Find out in 'Life As A Trainee' as you follow Baek Ah Reum on her journey to fame filled with love, betrayal, loyalty and secrets.