What was the right course of action when one’s former lover leaves to start a whole other vampire kingdom and now plans to marry another man? Chanyeol’s course of action was to storm into their castle and attempt to convince that former lover, Kyungsoo, to return to him.

Kyungsoo and Chanyeol are happily married with children. One day, Kyungsoo wakes up and finds himself 14 years in the past where he is still single and the children have not been born. Now, Kyungsoo has to make Chanyeol fall in love with him all over again. The catch is, they were enemies in the past and Chanyeol still despises Kyungsoo for a past tragedy.

Journalist Kyungsoo is out to uncover the dirt behind CEO Park Chanyeol who recently bought out his family's entire farmland in the name of "business". Other than finding himself helplessly attracted to Chanyeol, Kyungsoo may not be the only one who is spying on the other.

Kyungsoo's life is saved many years ago by someone whom he believes to be a kitsune. When he stumbles upon the mysterious Chanyeol, Kyungsoo has reasons to believe that Chanyeol may be the same kitsune, as well is hiding something from him.

Prince Kyungsoo of Vallis was never set to inherit the throne because he was born an omega. Thus, being sent off to marry Crown Prince Chanyeol of Zerura was an even bigger blow to him. However, Chanyeol doesn't want this marriage as much as Kyungsoo does and they conspire to give each other what they want, only to end up unraveling more secrets and having to face unresolved feelings.

Chanyeol, a sorcerer, decides to use forbidden magic to survive in a world where magic is dying. Through dubious means, he “marries” Kyungsoo, another sorcerer. Chanyeol is just using Kyungsoo as his personal blood bank; but his plan backfires when he begins to fall in love with Kyungsoo and contracts the Hanahaki disease as a result of his unrequited love and unexpected feelings.

Chanyeol, a famous music producer is caught plagiarising his work. He then moves to a rural island to hide and find inspiration to produce an original comeback album. There, Chanyeol meets Kyungsoo, a fisherman who loves his small-town life. Although they don't have similar goals and dreams, they discover new things to learn from each other and maybe develop a deeper relationship along the way.

Kyungsoo has always adored his close friend, Chanyeol, ever since high school although they soon fell out of contact. Years later, Chanyeol is living his dream as a professional Go player and Kyungsoo feels settled as a doctor. They are reunited as adults and Kyungsoo discovers that Chanyeol now has selective mutism and has always been alone all these years. Kyungsoo decides to step in and help Chanyeol and restore the relationship they once had.

Chanyeol's race possesses the ability to control fire but ironically, their planet is freezing over due to a dying star. Chanyeol abandons his planet and meets Kyungsoo, who is part of a warrior race where some can control celestial bodies including stars. Kyungsoo is also running away from his own planet where he is expected to give birth and repopulate. Kyungsoo can save Chanyeol's planet, but Kyungsoo doesn't want anything to do with the powers that have doomed his race to near-extinction.

Chanyeol is a centuries-old vampire who went into a deep slumber in an abandoned mansion. A rich family moves into the mansion, disrupting his slumber. Chanyeol is annoyed by the intrusion and tries to make them leave. Instead, Chanyeol ends up befriending the family's middle child, Kyungsoo, in an odd but endearing companionship that transcends their differences.