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.

Sid, who is a Shark Princess of the underwater kingdom, falls in love with Raun, a member of the boy band BUB, and runs away to the surface to see him. Things are going great until the famous teen actor, Jihan Kang, steps into her life unexpectedly and they keep crossing paths. Will Sid be able to keep her secret and get what she came up to the surface for?