Naeun has been abused by her brother ever since their parents died. She has always acted like everything was okay with the world. When her brother crosses her limits, she decides to run away. She runs into Mr Lee Soo Man, CEO of SMTOWN. He decides to take Naeun in on the condition that she becomes a SMRookie. With that, Naeun goes through the twists and turns of an idol-in-training. Scandals, over-protective idols and the schedules. And not to mention a little romance here and there. Naeun has to go through it all to debut.