Princess Sid of the Underwater Kingdom is destined to inherit the throne of the sea. However, she becomes a fan of the land idol 'Raon', and she becomes eager to see her favourite star, so she runs away to the surface. While leading a satisfying life as an ordinary fan, Sid's world is suddenly turned upside down when she meets the famous actor 'Jihan'. Unintentionally, the two keep getting entangled with each other, and Sid unexpectedly becomes an SNS star overnight…!! This story captures Sid's journey of growth and love as she navigates her new life on land, discovering herself between the two worlds of the underwater kingdom and the human world.