Castle Swimmer Chapter 104-110 deals with Kappa trying to fulfill prophecies. On the other hand, Siren is looking for Kappa and his father.

Castle Swimmer Chapter 90-96 deals with Kappa and his role as the Beacon as we see him fulfilling prophecies and breaking curses.

Castle Swimmer Chapter 83-89 deals with Kappa and Siren's struggle. Kappa meets Queen Nee and Krilli, hinting new arc and possible prophecy.

In Castle Swimmer Chapter 76-82, Siren saves Poogan's mother and meets an angelic figure whose curse is linked with his.

Castle Swimmer Chapter 97-103 illustrates the struggle Kappa has been going through since childhood, helping others, and sacrificing himself.

Kappa and Siren are learning more about the underwater world with each passing day. The Evil Witches are determined to fulfill their goal.

Castle Swimmer Chapter 62-68 explores Kappa and Siren's journey as they learn about other sea creatures and their goals and struggles.

Castle Swimmer Chapter 56-61 focuses on the individual lives of Kappa and Siren as they are learning new skills and meeting new creatures.

Castle swimmer chapter 49-55 illustrates Prince Siren and Kappa's individual journey, as they meet new creatures and try to survive daily.

Castle Swimmer webtoon takes an interesting turn as Prince Siren leaves the Shark Castle to explore the outer world