This Life is K-Pop Revenge

The perennial dreamer and aspiring composer, Nopara, has once again had his song credits stolen. In a moment of contemplating giving up on his dreams, he gets into a traffic accident and, upon opening his eyes, finds himself in a university lecture room from ten years ago. Before him, laughing, is Lee Joo-hyuk, the son of the CEO of Lee Woo Entertainment, the one who stole his dream. Alright! If I've been given a second chance, I'll bet everything and bring you down!! (Source: Naver Corporation, translated)