Yoon Jeonghan, the effortlessly charming and maddeningly arrogant CEO of Serene Quartz, a luxury lifestyle brand, has never gotten along with Detective Choi Seungcheol. In Jeonghan's eyes, Seungcheol is an uptight, self-righteous officer who carries a personal grudge against him for being rich, successful, and occasionally reckless. Seungcheol, on the other hand, sees Jeonghan as nothing more than a flirtatious drama magnet, a spoiled socialite who thrives on chaos and attention. Their paths, though occasionally crossing at charity galas and city events, have always ended in biting remarks and lingering glares. That changes when Jeonghan begins receiving anonymous, increasingly threatening packages: ominous notes, disturbing photos, and sinister little gifts with dark implications. Dismissing them at first as the work of a petty rival, Jeonghan's bravado falters when the threats turn personal. Seungcheol, deep into a serial harassment case targeting public figures, recognizes the pattern in Jeonghan's situation and begrudgingly steps in. Much to both their dismay, they're forced to work together, investigating leads around the city, interrogating high-society suspects at glittering events, and attending charity galas where appearances matter and danger lurks in plain sight. As the investigation pulls them closer, their sharp-tongued rivalry softens into teasing banter. Old grudges unravel, revealing unspoken admiration and buried attraction. Seungcheol realizes Jeonghan's arrogance masks sharp intelligence and an unexpected tenderness, while Jeonghan discovers Seungcheol's rigid exterior hides loyalty, humor, and a heart bigger than his badge. In the aftermath, both men must face not just the danger stalking Jeonghan, but the truth about their own feelings, and the fact that maybe their so-called rivalry was always just a very elaborate form of flirting.

What's worse than a blade at your throat or staring down your own death from a cliff? Getting married to Choi Seungcheol - the man even devils prefer to avoid. Yet here I stand, wrapped in silk I didn't pick, under chandeliers brighter than my will to live, listening to vows that feel more like contracts signed in blood. Everyone says this marriage will end a war. Cute. I say it's another battlefield - one I intend to walk across in heels and sarcasm. Because here I am, in a wedding hall dripping in roses and danger, smiling like I'm not actively planning how to make my new husband stop breathing.

Joshua, a physics major in college trying to make it through his first year but unfortunately his calculus skills are at doubt. To cover up for the loss he has to take up extra classes and unfortunately he ends up in chemistry with the one and only Professor Yoon. Yoon Jeonghan, a chemistry professor in the Seoul University of arts and science was nothing but a mean, rude, hot jerk. Some would go to the lengths of calling him a sadist. Having to be stuck in his class was the worst nightmare for any student from the university. Yet there were some who endured it just to be under his Handsome presence. Joshua hates Jeonghan's guts, and the feeling is mutual. A jihan ff again. I had this story in mind for a while but the original characters weren't jihan.