She's an Assassin; Falling for the Enemy

Alessa Romano is a hired assassin that was paid by La Corona Nera (The Black Crown) to kill the leader of their rival mafia clan, I signori Delle Notte (The Lord of the night), whose name is Marco de Luca She gets captured by their boss on her first attempt and is held captive by the clan and is offered a contract; she would have to kill the leader of the la Corona Nera group in exchange for her freedom. In order to achieve that goal, they agree that the have to be out in the public together and get her acclimated to the mafia world. They get into a contract marriage that is to last for as long as it takes to bring down their rivals but things get complicated as they slowly fall in love and have to fight for their love against all odds.