Ready to start streamingThe 21-Day Theory on your favorite streaming device? The 21-Day Theory is currently available to stream via subscription, rental, or purchase on in the US.
Here are a few useful insights about the Viu series. Originally premiering January 17th, 2025, "The 21-Day Theory" stars Narikun Ketprapakorn, Supakorn Saokhor, Pataraphol Wanlopsiri, Dom Hetrakul. The show spans 1 season(s) and currently holds a 90/100 rating on TMDb, which is based on reviews from 1 verified users.
Curious about the story? Here’s the plot: "Using the 21-Day Theory, a determined woman pursues a wealthy man to prove he's straight—but the truth defies her expectations."
