The 21-Day Theory backdrop

The 21-Day Theory poster

TV Series

Drama

The 21-Day Theory

9.0Jan 17, 20251 seasons

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

Seasons

Season 1 poster

Season 1

The 21-Day Theory season 1

4 episodes

Cast

Narikun Ketprapakorn

Pie

Supakorn Saokhor

Boss

Pataraphol Wanlopsiri

Euro

Dom Hetrakul

Barami

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Official Videos

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

Trailer

Open on YouTube