Patsapon JansuppakitkunX
Khunakorn SunanthamQ
Prat ItthichaicharoenToy
Jirayu SahguansinFrank
Warisara JitpreedasakulMind
Pischapron KetawattananonMook
Sarawut SiriphetManWhy it may be worth watching
- 21 Days Theory combines Drama storytelling.
- The principal cast includes Patsapon Jansuppakitkun, Khunakorn Sunantham, Prat Itthichaicharoen.
TV series
21 Days Theory
A playful rivalry turns into something more when a cocky senior dares his classmate to win the school’s top celebrity’s heart in just 21 days.
More detailsEpisodes
Seasons
People
Cast
Viewing guide
Is 21 Days Theory right for you?
Who may enjoy it
Best suited to viewers looking for Drama. The available catalogue spans 1 season.
Content notes
A regional age classification is not currently listed. Ratings vary by country; use this as a quick screening note rather than a complete parental guide.
Themes and topics
betlove at first sightcoming outfriendshiphigh schoolbased on true storyromancecoming of age
How it compares
Viewing guidance uses the title details shown on this page; classifications may differ by region.
Community
Reviews
No reviews yet. Be the first to share what you think.
Log in to write a review.
Videos
Related videos
You may also like
From FMM Reviews
More stories about movies and television
Movie guide
Hope (2026): Cast, Story, Release Details
A complete guide to Hope, including its story, cast, release details, ratings, and where to watch or download it.
Read the full guide Movie guide
Taboo (2020): Cast, Story, Release Details
A complete guide to Taboo, including its story, cast, release details, ratings, and where to watch or download it.
Read the full guide TV guide
Kickin' It (2011): Series Review, Plot, Cast and Episodes
This Kickin' It (2011) review examines the family and action & adventure series through its premise, storytelling, cast, performances, themes, production choices and audience response.
Read the full guide 
Agnez Mo
Kathleen Robertson
Lenny Rush
Judy Levitt
Scarlet Rose Stallone
MyAnna Buring
Johnny Flynn
Harry Lloyd
Gretchen Mol
Tom Holland
Tian Xiwei
Alan Ritchson