Luna, the daughter of an Italian mobster, is finding it quite difficult to fit in to the underground world. She's known for her kind heart and how shy she is, everyone in the underground treating her with nothing but respect and loyalty. Luna is sheltered from any violence or mission, always being surrounded by guards for her safety. Until one day her father introduces the newest addition to the mob. Kang Yeosang moves to Italy to make a deal with the famous mobsters, joining his underground in the process. When first setting eyes on Luna, the only thing on his mind is getting her in bed, not expecting that this shy, kindhearted girl can get past his outer shell without any difficulty. What is Luna going to do when Yeosang confesses his feeling to her? Will she return them or will she distance herself from him?