Lord of the City, I’m Flirting with You on Purpose

A deranged male lead and a scheming female lead Everyone says he kills without mercy, poisoning the inhabitants of an entire city in the blink of an eye. When they first meet, she flees in a panic, barges into the place where he's bathing like a lecher, and says, “After this, I'm sure...” Later, she says, “My lord, why should I fear you? I want to learn from you how to kill...” Later still, she says, “My lord, your blade is just perfect for killing dogs...”