Revenge. Revenge was everything Yongguk wanted. He had spent 20 years on his revenge. He had spent 20 years to build him, the perfect machine. Why he build the perfect machine? Because it was going to take his revenge for him. Yongguk dropped out of school when he was 18, but he wasn't stupid. He was really smart. The robot boy was going to take his revenge for him and nobody would ever discover that he was the person behind the genius idea so he could not get punished. Will his revenge succeed?