Who are William Est — William Jakrapatr and Est Supha

The two of them, briefly

• William — Jakrapatr Kaewpanpong (วิลเลี่ยม จักรภัทร แก้วพันธุ์), born 14 February 2005. Actor and singer.
• Est — Supha Sangaworawong (เอส ศุภะ), a GMMTV actor who was previously a competitive swimmer on the Thai national team.
• The pairing: "WilliamEst", formed in early 2024.
• Signed to: GMMTV, with William also under Riser Music as a musician.

William has a second job: singing

This is what sets William apart from most GMMTV actors of his intake. He is the lead vocalist of LYKN, a boy group under Riser Music, and plays both guitar and piano.

It also explains why this event is a concert rather than a fanmeeting. The music is not filler added to reach a running time; it is what one half of the pair does all year.

From ThamePo to You Maniac

The pair debuted as leads in ThamePo: Heart That Skips a Beat (2024), William as Thame and Est as Po. That is the project that put the name on the map.

In 2025 they appeared in Me and Thee, with William as Rome, the lead’s younger brother.

Then came You Maniac (2026), William as Dean and Est as Moth, broadcast from 29 August to 31 October 2026. Its pilot trailer set a GMMTV record for views in the first 24 hours, more than 17 million across the official platforms. The two also sing its theme, Red Flag.

The official videos for all of this sit on the show page, alongside GMMTV’s own concert spot.

Why this concert is a step up

Impact Arena is the largest room GMMTV events normally use. For a pair formed in 2024, a two-night headline concert there is a marker most take considerably longer to reach.

They are not strangers to the venue either: there was a two-day William Est WE Magnetic FANCON before this, and a William-Est Racing event at Impact Arena in May 2026.

How a concert differs from a fanmeeting

• Focus. A concert is built around the performance; a fanmeeting is built around the interaction.
• Scale. Impact Arena holds tens of thousands. A fanmeeting theatre holds hundreds.
• Benefits. At a concert, photos and hi-touch attach to the top tiers and often go to a draw. At a fanmeeting they are the point of the event.
• Price. A concert’s cheapest tier is usually cheaper than a fanmeeting’s, simply because there are far more seats.

Our guide on fanmeeting, fancon and fanday separates the three, because the names get used interchangeably and the prices do not.