When I Became the Daughter Of The Villainous Grand Duke

When I regressed, I encountered the Mad Assassin, Grand Duke Belroc, again. Unknowingly, I ended up helping him. But when he said he’s looking for me, I paled and panicked… “He’s going to kill me, isn’t he?” Why did I help him? I’m going to regret this so much. “You saved my life, so I should repay you.” Uh, repay? “If I become your father, that should do.” Wait, did I just hear something strange? “From today, we’re a family.” The notorious mad assassin known for killing everyone who crosses his path, and the future villain who will rebel against us, is saying he wants to be my family? Do I have to be happy about this, or should I cry?