My Rare Blood Saved Their Only Heir

Synopsis

"Please, save my grandson! We'll pay whatever you want!" On the other end of the line, Lily Murphy, the wealthy lady who used to look at me with utter disdain, was now crying desperately. I almost burst out laughing. Three years ago, I volunteered to donate blood to save her grandson, and all Lily did was shoot me a look of disgust and say, "It's just a little blood. What's the big deal?" Now, her whole family was taking turns calling me countless times. I just replied, "Don't know you."