Ordinary people don't know that beyond the human world lies the demon realm, with one Demon King and countless demons. They look just like humans, but have no hearts, only demon cores. No one knows how these demons came to be. Some say they are the embodiment of humanity's wicked thoughts. They are savage and bloodthirsty. The human world also has people with special abilities, and over time, exorcist organizations took shape. After generations of effort, the Qi family became the largest exorcist clan.
At first, Qi Yi wanted to find a lock. Later, she realized that she was his key, the one and only person who could unlock all his emotions.
Yun Rong holds a grudge. Anyone who has ever hurt her, as long as they're still breathing, will pay for it.
But later, there was someone who, when asking her for forgiveness, made her feel that perhaps they could... talk it over?
The story of a retired exorcist who falls in love with the Demon King.
The male lead joins the entertainment industry after retiring, but there's not much about showbiz in the story. The female lead is a teacher, so she gets summer and winter vacations.
Theme: No matter what you've been through, never give up on life. The future will always be bright.