Following the sacrifice of a great hero who defeated the nefarious Demon Lord, an angel grants his wish to be reborn with his memories intact as Hero Baek. Utilizing his memories, he writes a web novel of his past life. Eventually, he lands a job at an entertainment company under CEO Yeonhwa Do, who is actually the reincarnation of his mortal enemy, the Demon Lord. When Yeonhwa discovers Hero's novel, their inevitable collision begins.