拥有褐色眼睛的普通学生伊京，酷似夏天阳光的高中足球选手秀伊。18岁的夏天，陷入意想不到的爱情的伊京和秀伊描绘着一起的未来，迎来了20岁。与上大学的伊京不同，秀伊直接进入社会，在陌生的幸福和小小的误会中，两人将面临新的季节。

To save her father from certain death in the army, a young woman secretly enlists in his place and becomes one of China's greatest heroines in the process.