The 21-Day Theory poster

The 21-Day Theory (2025) – Trailer & Where to Watch

TV SERIES ★ 9.0/10 2025 1 season Drama

Using the 21-Day Theory, a determined woman pursues a wealthy man to prove he's straight—but the truth defies her expectations.

Where to watch The 21-Day Theory (US)

No streaming services list this title in your region yet. Check back soon — StreamEx updates availability daily.

Cast

Narikun Ketprapakorn as Pie, Supakorn Saokhor as Boss, Pataraphol Wanlopsiri as Euro, Dom Hetrakul as Barami

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