A sunshine girl. A stone-faced genius. One mission that just might change everything. Nora Johns believes in smiles, sparkles, and second chances. The chirpy, creative girl with a heart full of glitter is the type to write strangers' names in her journal just because they looked sad. So when she gets paired with Choi Seunghyun-the top student with the icy stare, sharp tongue, and absolutely zero facial expressions-for a semester-long mentorship project, she sees it as more than bad luck. She sees it as a mission. Operation: Make Him Smile. Seunghyun doesn't care for bubbly girls or forced friendships. He prefers his silence, his books, and his hoodie pulled over his head. But Nora... she's loud. She's weird. She's everywhere. And somehow, she's always trying to make him laugh-with terrible jokes, cheesy pick-up lines, or glitter-stuffed sticky notes in his textbook. What starts off as a silly game becomes something more when Nora learns that Seunghyun's frown might be hiding something heavier than just grumpiness. And as Seunghyun begins letting her in-grudgingly, clumsily-he starts to realize that maybe, just maybe, the girl he once found annoying is the light he didn't know he needed. A heart-fluttering story of sunshine and shadows, late-night texts, accidental hand brushes, and a smile worth falling for.

When Aria Stevens, a struggling journalist, sneaks into a masquerade ball hosted by the country's most dangerous crime family, she accidentally gets mistaken for the fiancée of the heir-Choi Seunghyun, a cold, but a hot ass man with blood on his hands. To protect her identity, she plays along. But Seunghyun knows she's lying-and he doesn't care. Because she's perfect for his plan. He needs a fake bride to earn his father's throne. She needs a story, so they strike a deal. But the fake relationship quickly turns into something real, something obsessive. Seunghyun becomes violently possessive, unable to tell where the lie ends, and his need for her begins.

Lenny and Seunghyun come from power, wealth, and legacy-each the only heir to their respective family empires. Their fathers, best friends and long-time business partners, envision a future where their children rule the corporate world together. But there's one problem: Lenny and Seunghyun can't stand each other. Raised in privilege and pride, both believe they're the superior successor, constantly clashing with biting sarcasm, smug smirks, and unspoken rivalry. Tired of their antics and determined to secure their companies' futures, the fathers make a shocking decision-to unite the two in an arranged marriage. What begins as a forced alliance built on tension and ego slowly morphs into something more dangerous: desire, vulnerability, and perhaps... love. But pride doesn't die easy, and falling for your biggest rival might be the hardest deal either of them has ever made.

Ronnie witnesses a murder in an alley-brutal, clinical, quick. She sees Seunghyun's face. He sees her. Instead of killing her, he lets her go. He tells himself it's curiosity. But days pass, and she doesn't report him. She pretends she sees nothing. He starts watching her. Following her. Testing her. She knows he's there-and instead of running, she welcomes it. She's been waiting for a monster to look her in the eye. And now that he has, she can't look away. But what begins as fascination becomes a game, and neither of them can win. Because Seunghyun has a new target-and it's Ronnie.