The Regent's One and Only Medical Concubine

A modern-day top assassin transmigrates and is tasked by the System with saving people. With the help of her spatial realm, no difficult illness is beyond her ability to treat. A certain prince complains, “What is this? All you ever do is save people! How am I supposed to woo you?” Ning Xin'er is at a loss for words and doesn't want to say a thing. Though the prince is displeased, he still indulges her. “Since you love saving people so much, I'll round up everyone in the world who's about to die and bring them to you.” She gives him a look that makes her meaning clear. The prince immediately backs down, rolls up his sleeves, and stops complaining. Instead, he joins her in saving people.