The title says it all

When Niki needs a man-not for love, but for a reason only he knows-he sets his eyes on Jungwon. One night, at a glamorous gala, he publicly declares Jungwon as "My Wife." No one knows why. Not even Jungwon. But from that moment, Jungwon's life changes. He's forced into a world of secrets, lies, and passion-where nothing is as it seems.

Niki is a Vampire Jungwon is a normal human Both are in same Group called Enhypen

Just so you know this book won't just be of JaySun their will be other ships just that will be the main ship there will be others like heejakehoon and wonki. Description: Sunoo was a 17 year old teenager but in a Tragic way a boy at 18 years old went missing everyone had looked and called for people everywhere to look for there small towns golden boy, but Sunghoon was never found, one day another young boy at the age of 16 was also taken, Sunoo's town was very cautious and looked so far into the lines that they thought the next to be taken would be another attractive boy at the age of 17, but no one knew for sure so they decided any boy who was within the age brakes of 16-18 would be sacrificed, while they slept peacefully the villagers would put a hey bag over their heads and would take them to random parts of the Forrest that engulfed the town. Sunoo was one of those boys he was taken while he was sleeping and dragged to a part of the Forrest so deep he was sure that the people who took him there had died on their way back to the town. But what if a vampire really does find him, and what if that vampire helps him and one day he finds his way home. Ships: JaySun Heejakehoon Wonki

After their rooftop "almost confession," Niki and Jungwon thought life would go back to normal. It doesn't. When a sudden building renovation forces Jungwon out of his apartment, Niki just happens to offer him a place to stay - a "temporary" arrangement that turns into full-blown domestic disaster. Now, they share the same fridge, the same bathroom, and way too many accidental moments of closeness. From morning chaos and sarcastic fights to late-night tension over the smallest things, their city life becomes one long comedy of emotions. But beneath the teasing and chaos, both start realizing something neither dares to say aloud... "It's not just living together anymore, is it?"

"City life is busy enough... until you meet him." Niki is confident, mischievous, and loves to tease everyone around him-especially Jungwon, the shy, serious, and sarcastic guy who tries (and fails) to resist. From coffee mishaps and subway collisions to rooftop adventures and rainy-day disasters, these two are destined to clash... hilariously. Will Jungwon ever survive Niki's teasing? Or will he secretly enjoy every chaotic moment? Laugh. Fluster. Fall in love. Welcome to Urban Hearts & Mischief.

The rider quadrant of Decelis is in chaos. Their commanding officer has been hit. And it's the work of another rider who has no business here anymore. Because he is a fucking traitor. Or: Six Flames is the name of the group of riders that work as an independent working force in Decelis. They are responsible for training Assassins. Yang Jungwon is enlisted to enroll for the rider's quadrant when his brother is murdered. He is determined to find his brother's killer and put him to the executioner's axe. But enrolling requires him to pass through a series of trials. In the midst of it, the commander of his associate is attacked by one of the betrayers of their group. There used to be six survivors, but now there are five. One of them betrays the leader as he backs out of an important job at the last moment. Now, Jungwon must not only chase his brother's killer but also figure out why Sim Jaeyun betrayed them and why it hurts him so much to admit that. Cross-posted on AO3

Jungwon is a reserved, cautious young man who prefers keeping his feelings to himself. Niki is charismatic, teasing, and effortlessly draws people in. They meet by chance (e.g., coffee shop or music studio), and Jungwon becomes instantly captivated by Niki's presence, especially his piercing, expressive eyes.