10 billion... really? Yes, 10 billion. How can one bag of blood be worth 10 billion?! The blood received through a transfusion after an accident just happened to be worth 10 billion. The debt-ridden protagonist’s worth keeps rising unnecessarily. There’s a way to pay it back. A secret mission is given to a girl who wants to see light instead of debt. How can I pay off my debt without drawing blood? It’s simple. Jeongseol, her mission is just one thing. Awaken the sexual desire of Lee Harang, the patient. But, also steal her heart. An atrocious mission to not only take blood but also love. The thrilling art of seduction for a debtor begins. I, Jeongseol, am running to seduce Lee Harang right now!