Shim Changmin is a professor in a prestigious top university in Korea. He was doing an experiment and he succeeded. While he thought the world problems could be solved with this break through experiment, he found out it wasn't as pleasant as what people made it to be. The experiment made him the way he was, and he couldn't change at all. It scared him.

But he was in good hands. Jung Yunho was a good friend, a great lab partner and a respectable genetic engineer just like him. Yunho had always been by his side, and told him he would always be by his side. Changmin believed his every word because he knew Yunho had never disappoint him. He trusted Yunho and Yunho trusted him. That's all that he needed when he made the discovery.

But, what will he do when Yunho left one day?