The 21-Day Theory poster

The 21-Day Theory (2025)

TV Series ★ 9.0 45 min

Drama

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

Chainarong Tampong Director

▶ Play

Episodes

Quick facts

Released
January 17, 2025
Runtime
45 min
IMDb
tt35362527
Country
Language
Studio
change2561

Themes

Cast

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

More Like This

More like The 21-Day Theory ›
Affair 2024 ★ 8.2
Theory of Love 2019 ★ 7.7
Method 2017 ★ 6.9
Pride 2014 ★ 7.7
Love in the Big City 2024 ★ 7.8
Monster 2023 ★ 7.9
Moonlight 2016 ★ 7.4
Addicted 2016 ★ 7.4
SOTUS 2016 ★ 7.0
Behind the Candelabra 2013 ★ 6.6
2gether: The Series 2020 ★ 7.9
The Theory of Everything 2014 ★ 7.8

Also Worth Watching

The Newsreader 2021
Ticket to Heaven 2026
The Boy Next World 2025
Your Sky 2024
House of Guinness 2025
Tyler Perry's Ruthless 2020
The Eclipse 2022
Bel-Air 2022
Offspring 2010
Dare You to Death 2025
Dangerous Romance 2023
Only Friends 2023
Goliath 2016
Unchosen 2026
Julia 2022
Life on Top 2009
Sullivan's Crossing 2023

Frequently asked questions

What is The 21-Day Theory about?
Using the 21-Day Theory, a determined woman pursues a wealthy man to prove he's straight—but the truth defies her expectations.
Who created The 21-Day Theory?
The 21-Day Theory was created by Chainarong Tampong.
Who stars in The 21-Day Theory?
The 21-Day Theory stars Narikun Ketprapakorn, Supakorn Saokhor, Pataraphol Wanlopsiri, Dom Hetrakul.
When was The 21-Day Theory released?
The 21-Day Theory is a 2025 drama series.
Where can I watch The 21-Day Theory?
You can watch The 21-Day Theory with full details, cast, and streaming options on 3eyedraven.