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Watch The 21-Day Theory Online

  • 9/10
  • COUNTRIES: Thailand
  • Subtitles: ภาษาไทย

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

Watch The 21-Day Theory online. Featuring Narikun Ketprapakorn and Supakorn Saokhor, The 21-Day Theory has 1 seasons and 4 episodes in total. It is available for streaming online in the UK It is classified as Drama genre series and the average rating across the web is 9. The TV series was filmed in Thailand and was first aired on 2025. Read Less