The heroine discovers her secret former lover is her sister’s fiancé. To get revenge on her stepsister and stepmother, she seduces him to ruin their shot at wealth, even using his smitten nephew. He battles logic and lust; she wavers between genuine affection and calculation. When revenge ends, their future together hangs in the balance.
Seducing My Stepsister's Fiancé has 21 episodes (ongoing).
Lantern Alley Pictures makes vertical short dramas built on cliffhangers, revenge and second chances.
You can watch Seducing My Stepsister's Fiancé online on Runotoon, in the web browser on your phone or computer. There is no app to download. Start with Episode 1.
The first 10 episodes are free, and you don’t need an account to start. Each of the other episodes unlocks with 15 Coins. A new free account comes with 75 Coins, you can collect free Coins every day, and Runotoon Pass adds Coins every week.
Seducing My Stepsister's Fiancé has 21 episodes on Runotoon so far, and new episodes are still coming. Together they run about 61 minutes. The latest episode came out on November 5, 2026.
The heroine discovers her secret former lover is her sister’s fiancé. To get revenge on her stepsister and stepmother, she seduces him to ruin their shot at wealth, even using his smitten nephew. He battles logic and lust; she wavers between genuine affection and calculation. When revenge ends, their future together hangs in the balance.
Yes. Its original language is English, and it has subtitles in German, Spanish, Filipino, French, Indonesian, Italian, Brazilian Portuguese, Thai, and Vietnamese. Some languages may not cover every episode yet.
