The 21-Day Theory

Overview

Pie, a theorist female tutor, has just escaped the trauma of love from her ex-boyfriend who likes to beat and assault her, until she meets Boss, a young dancer who has to flee his identity because his father, Barami, does not accept having a gay child. Thinking that the two have a deep relationship, Pie invites the boss to experiment with the 21-day theory by trying to become girlfriends, but the story throughout 21 days is too complicated and complicated for both of them to predict how it will end up!

90%

Cast

Narikun Ketprapakorn

Pie

Total episodes: 4

Supakorn Saokhor

Boss

Total episodes: 4

Pataraphol Wanlopsiri

Euro

Total episodes: 4

Dom Haetrakul

Barami

Total episodes: 4

Narikun Ketprapakorn

Pie

Total episodes: 4

Supakorn Saokhor

Boss

Total episodes: 4

Pataraphol Wanlopsiri

Euro

Total episodes: 4

Dom Haetrakul

Barami

Total episodes: 4

Extra

Release Date

January 17, 2025

Last air Date

February 7, 2025

Status

Ended

Original Language

Thai

Networks

Available On

Currently it's not available for streaming.

You can visit JustWatch for more information.

seasons

Season 1

Aired on: 2025 | 4 Episodes

Psychological studies have found that repeating an action for twenty-one consecutive days can help change a person's behaviour, such as waking up early or exercising. The idea, extended to matters of love, evolves into the 21-Day Theory: the belief that if you pursue someone for twenty-one consecutive days, you'll win their heart. But what happens when a woman uses the 21-Day Theory in an attempt to turn a gay man straight? This story revolves around a woman with a crush on a wealthy and seemingly perfect man who's remained single for a long time. Rumours swirl about his sexual orientation, but she refuses to believe them. He never confirms or denies the speculation that he's gay. Determined to uncover the truth for herself, she employs the theory to pursue him.