The two have known each other since they were three years old. They are neighbors and childhood sweethearts. They have always been in the same school or even the same class from elementary school to university. They saw through each other's "disguise" in childhood and formed a secret "alliance". Externally, they acted as "gentle beauties", but internally they were comrades who understood each other best. They fought side by side with decisiveness and determination, but also had the secret warmth of childhood sweethearts.
