Ryu Seo-woo is an award-winning best vocalist who tragically died in a plane crash and transmigrated to a BL novel, "Serenade Me, My Angel," which he read out of boredom. He transmigrated into the body of the sub-villain, who shares his name but is a C-list singer with a ruined voice due to throat damage. Living in a decrepit house with his five-year-old triplet sons (Seo-jun, Seo-min, and Seo-jin) who despise him for years of neglect and verbal abuse, Seo-woo is determined to rewrite their lives. The novel's main couple, the stoic CEO Moon Woo-seok and his innocent, angelic singer Jin Yu-jin, are destined for a happy ending. In the original story, Seo-woo's character dies in a fire, leaving his genius triplets to be adopted by the main couple. However, the transmigrated Seo-woo has no intention of dying or letting the original plot play out. Can he win over his sons and forge a new path?

A salaryman, Liu Xun age 25 years old from the 21st century suddenly found himself in an unknown place once he woke up. He then realized that he actually got transmigrated into a cultivation novel. And the body he occupied is the Big Boss Villain, Wu Jing! Although his future looked so bleak he firmly believed that as long as he didn't interact with the protagonists he would be fine. However, he didn't expect that no matter what he does he always meet the protagonist! What's worse was that it is not even the female but the male protagonist, Wan Yu instead! Nevertheless, thinking that the protagonist was still a child he decided to take him under his wing and be his big brother. Years have passed and Liu Xun was currently having a deep enmity with the protagonist. Liu Xun:''I just look at your future wife for a bit so why are you having that scary looks on your face!'' He painstakingly raised him for years but for a woman who he has just met this ungrateful brat decided to turn against him! So hateful! Liu Xun:''Do you have a 'tearing clothes' fetish or what?! Stop tearing them whenever you are angry with someone else!'' The money he used to buy clothes is a lot more than what he used to buy the medicine! Wan Yu:''Behave or else I won't be polite anymore.'' Liu Xun:''Scram!''