Lee Gun used to be a promising tennis player, but he was injured. After that, he lost all of his self-esteem, and his life completely changed. With the use of a memory eraser, his memory is erased, and he is reborn with maximum self-esteem and presence. His first manipulated love is Kyung Ju Yeon, a psychiatrist at the brain research center. Other people around him include his younger brother Lee Sin, who is ranked the world’s no.1 ranked tennis player. Meanwhile, Jeon Sae Yan is Lee Sin’s translator.