"Mercy" is a song by JC Chasez, a former member of the boy band NSYNC. The song tells the story of a person who is deeply infatuated with someone and obsessed with obtaining their mercy or forgiveness. The lyrics describe the intense emotions experienced by the protagonist, who feels like the other person's presence is running through their veins and they can't get them out of their mind. The protagonist expresses their love as a burning desire, willing to go to extreme lengths for the other person, even breaking the law or selling their soul. They admit feeling lost and wasted without the person's presence and desperately long for their mercy to ease their pain. The song also reflects the protagonist's jealousy and insecurity, as they struggle to imagine the person they desire being with someone else. They pray that one day the person will be with them and promise never to let them go. The repetitive chorus emphasizes the protagonist's plea for mercy, highlighting the agony and insanity they feel without the other person. It conveys their desperate desire to be reunited and the intensity of their love and longing. Overall, "Mercy" portrays a story of intense love, obsession, and the longing for forgiveness from the person who holds the protagonist's heart.