He and she were childhood sweethearts. They made an agreement at the beach to only be each other's partners when they grew up, but they were separated due to a fire. They are sisters who love each other, they are brothers who live and die together, what kind of love sparks will be sparked when they meet them. The childhood sweethearts who met in secret have been unable to recognize each other because she lost her childhood memories in the fire. What will be their final outcome? Will they renew their relationship? What kind of love journey will the princess and prince take us on?