The 21-Day Theory

9.0

2025•45m

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

Trailers & Videos

Thumbnail for video: “เป็นแฟนกัน 21 วัน” สุดท้ายแล้วทฤษฎีนี้จะลงเอยแบบไหน ? [Club Friday The Series ทฤษฎี 21 วัน Trailer]

“เป็นแฟนกัน 21 วัน” สุดท้ายแล้วทฤษฎีนี้จะลงเอยแบบไหน ? [Club Friday The Series ทฤษฎี 21 วัน Trailer]

Seasons

4 Episodes • Premiered 2025

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

Still image for The 21-Day Theory season 1 episode 1: Episode 1

1. Episode 1

Still image for The 21-Day Theory season 1 episode 2: Episode 2

2. Episode 2

Still image for The 21-Day Theory season 1 episode 3: Episode 3

3. Episode 3

Still image for The 21-Day Theory season 1 episode 4: Episode 4

4. Episode 4

Cast

Photo of Narikun Ketprapakorn

Narikun Ketprapakorn

Pie

Photo of Supakorn Saokhor

Supakorn Saokhor

Boss

Photo of Pataraphol Wanlopsiri

Pataraphol Wanlopsiri

Euro

Photo of Dom Haetrakul

Dom Haetrakul

Barami

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