Mush and Co get to finalize their debut song with either Han Gyeol or Chan Young’s. The tension rises as Han Gyeol and Chan Young compete for the debut song. Jin Hyuk suggests Han Gyeol to write a song for Yoo Na, but Han Gyeol hesitates. Meanwhile, In Woo visits Han Gyeol out of the blue.

Han Gyeol asks So Rim to sing for him officially. They go on a date where they learn more about each other. Chan Young shows interest and gives advices to the new group that’s debuting. Meanwhile, a reporter gets suspicious of Crude Play’s genuity.

So Rim finds out the truth behind Han Gyeol’s song. She is devastated by the fact that he was thinking of someone else when he made the song. Han Gyeol is ever so worried that So Rim would get hurt from his lies. So Rim’s band gets to perform on stage for an audition program, but Han Gyeol does not want to see her get crushed by being publicly shamed.

So Rim tells Han Gyeol that she can’t sing his song due to the promise she made with Chan Young. Han Gyeol is frustrated as he doesn’t understand what she means. Meanwhile, Chan Young gets anxious as he is worried that Han Gyeol might take So Rim away from him.

So Rim officially becomes a trainee at Sole Music along with her two friends. Everyone who hears So Rim’s singing is eager to nurture her talent, including Chan Young and Jin Hyuk. Meanwhile, Han Gyeol asks So Rim to sing the song he wrote with the inspirations he got from hearing her voice.

Han Gyeol listens to the song recorded by So Rim and is instantly attracted to her captivating voice, which makes him go on a search to find the owner of that voice. Meanwhile, Mr. Bong creates an opportunity for So Rim to let her talent shine. With the help from her teacher, So Rim is given a chance to audition for Sole Music.

So Rim and Han Gyeol cross paths once again. This time, So Rim decides to tell him what’s been on her mind ever since she met him. However, all Han Gyeol cares about is deleting the recording So Rim has on her phone. Without knowing Han Gyeol’s intentions, So Rim goes on to record a song by adding the lyrics to the melody Han Gyeol came up with.

Han Gyeol, otherwise known as K, is a genius producer who creates songs for Crude Play, the most popular band in the country. To Han Gyeol, everything from the smallest noise to a random encounter becomes an inspiration for his music. One day, he borrows someone’s phone to capture a moment of inspiration. Little did he know, this action leads him to the sound he’s been seeking all his life.