Lee Gun was a promising tennis player, but he suffered an injury. As a result, he lost all his self-confidence and his life changed completely. Using a memory eraser, his memory is wiped clean and he is reborn with the utmost self-confidence and presence. His first love, who has been manipulated, is Kyung Ju Yeon, a psychiatrist at the brain research centre. Among the other people around him is his younger brother Lee Sin, who is the world’s number one tennis player. Meanwhile, Jeon Sae Yan is Lee Sin’s translator.