Little Fury and the Mafia King (Jeon Jungkook)

Jungkook arrives from a mission, stained with blood, his suit torn. The most dangerous man in the country. But when he opens the door and sees Bella in the kitchen, arms crossed and a serious expression... he turns pale
— You're late. she says, her voice calm, yet deadly. Jungkook gulps. He stares down assassins without blinking... but in front of her, he even loses his breath.
— I-I was late because of... work reasons. he responds, almost whispering. Bella raises an eyebrow. He puts his hands behind his back, as if he were standing before a general. She takes a step forward, looking at him as if she could pierce through his soul.
— You promised you'd be back by ten. It's two in the morning. Jungkook doesn't even breathe.
— I'm sorry, love...
She sighs, turns her back, and he lets out a breath of relief as if he had survived a shootout, but she turns around again to face him and approaches slowly, making Jungkook gulp

The entire underworld knew a name that sent chills down anyone's spine: Jeon Jungkook. Bloodthirsty. Intelligent. Uncontrollable. He ruled the mafia with an iron fist and blood. No enemy survived twice, and no traitor dared to meet his gaze. But curiously, this same man, feared by all, was afraid of only one person: his wife, Bella. Small in stature, but gigantic in personality. Kind to those who deserved it, polite, but incapable of bowing her head to anyone. An impossible woman to conquer, and that's precisely why Jungkook fell to his knees for her. He tried to dominate Bella?
Yes. Did he succeed? Never in his life. She was a whirlwind, and he was the only man on Earth capable of loving her even when he thought he would die of fear. But when Bella lays her head on his chest to sleep, the most feared mobster in the country wraps his arms around her as if she were his only shelter in the world. One day, at a mafia business event, an idiotic, sexist man looked Bella up and down and said, "You should stay in the kitchen. Women don't have to work." The entire room fell silent. Everyone waited for Jungkook's reaction, thinking he would kill the man. But it was Bella who moved. She smiled sweetly, walked up to the man, and broke his arm with a single blow.
Then he gave her such a violent beating that no one dared interfere. Jungkook? He watched in silence. Proud. And terrified. From that day on, the underworld feared two Jeons. And her husband was the one who respected her the most. Bella took singing lessons every Tuesday; Jungkook personally dropped her off there, always armed, always vigilant, as if protecting his wife was his life's mission. But the truth was simple: she was his only weakness. When Bella smiled at Jungkook, he forgot he was a monster. When she sang to him, the most ruthless mobster in the country transformed into a lovestruck boy. And when she got angry, he became the quietest man on the planet. "If I breathe wrong, she'll bury me alive."