64 eps
New on Back'n'Time
The Beast King's Secret Siren
Episodes 1–10 stream here. Episode 11 onward continues in the official app.
Episodes64 episodes · 1–10 free here · 11–64 in the official app
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Free on Back'n'TimeContinues in the official app
The story
Quick answer: 64 episodes, English original audio, and episodes 1–10 play right here tonight.
On the surface, the floating city of Navia rules a blackened ocean. Beneath the waves lies Nerathis, bound by a five-hundred-year-old tribute: every year, human girls are dragged into the deep and offered to the Leviathan, a colossal beast chained in the Abyssal Vault. Ayla is the latest tribute. Her younger sister Emery refuses to let her go alone—disguising herself as a boy and posing as the Navian prince, she descends into the deep to rescue her. But the beast does not want Ayla. When the Leviathan senses Emery, it does not rage. It responds.
For five hundred years it has ignored every tribute. It has been waiting. Emery carries the blood of the Sirens, the royal sea race believed extinct since the Great Flood—and her heartbeat resonates with the caged king. Between its scales, human green eyes open: Damon, once king of Nerathis, half-turned into a monster after humans butchered his family. The regent Zane has kept him imprisoned, drawing his bloodline to fuel his tyrannical rule. But the deeper their bond grows, the more Emery has to lose—and the court is watching.
- Episodes
- 64
- Language
- English
- Free here
- Episodes 1–10
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Questions people ask
How many episodes are there in The Beast King's Secret Siren?
The Beast King's Secret Siren has 64 episodes in total. Short dramas run about one to two minutes an episode, so it is an easy one-sitting binge. Episodes 1–10 play right here on Back'n'Time; episodes 11–64 continue in the official app.
Can I watch The Beast King's Secret Siren for free?
Yes — the first 10 episodes are free to watch on this page, no account and no sign-up. From episode 11 the series continues in the official app, where the platform's own unlock options apply.
What happens after episode 10?
Tap episode 11, or any tile with a lock on it, and we hand you over to the official app at that episode. If the app isn't installed yet, you'll land on its store page first. We don't host the locked episodes and we never ask for payment details.
What's The Beast King's Secret Siren about?
The story section above has the setup without spoilers past episode 10.
What language is The Beast King's Secret Siren in?
The audio is English. It was added to Back'n'Time on Nov 7, 2026.
How watching works
Start here, free
Hit “Watch episodes 1–10 free” and play the first 10 episodes on this page. No login, no card.
Tap episode 11
When the free part ends on its cliffhanger, tap episode 11 or any locked tile in the grid above.
Finish in the official app
We send you to the official app at the same episode, where the remaining 54 episodes continue.
Back'n'Time only offers a free preview of episodes 1–10. The complete series, and any unlocks after episode 10, are provided by the official platform.
Episode 11 continues in the app
You've watched the free part. The Beast King's Secret Siren carries on in the official app — we'll open it at this episode.
Continue in the official appKeep watching 1–10