Jungkook's father doesn't fall in the record of the best fathers in the world. Jeon Jungkook, the one and only son of the CEO of the Jeon Tech Industries LTD., and one of the richest people in South Korea, Jeon Ji-Woo and his wife Jeon Hina. With an abusive childhood, he was raised and is quite an introvert, but he can't behave like the way he wants since his father knew how to get what he wanted from Jungkook. His father's latest invention for the evolution of the company ends up ruining Jungkook's life. The invention was going to represent a breakthrough in science and technology, but after it gets stolen, things go south. Right after that, Jungkook isn't Jungkook anymore. The invention that should've not been such importance to him suddenly become his obsession. But his mind and heart aren't at the same place anymore. The remaining pieces of his heart are disappearing faster than before, and it's not because of heartbreak. Maybe his heart is actually disappearing. As he drops pieces of his remaining heart on to an abyss, someone catches them and follows the trail into the door of his heart and restore it. But will they be able to find the right person or will they get mislead? But to whom should she return it to? And who is she following? Will she reach who she wants or will that trial lead somewhere else, to a point of no return?