Heartbound

Heartbound (สุดทางหัวใจ) is an upcoming Thai BL series from GMMTV that mixes romance with action. At its centre is Aiyara Singhamekha, who stumbles into trouble with Gun De Castro, the president of a company and a man who lives with danger on every side. One of them is fierce, the other is just as hot headed, and putting them together is a bit like pouring oil on a fire.

Aiyara ends up pulled into a risky game with very high stakes. Meeting him changes something for Gun De Castro as well. A man used to keeping everything under control suddenly finds that he cannot, and he has to face fears that have been rooted in him for a long time if he wants to let someone stand beside him in life.

The series adapts the Thai novel สุดทาง… หัวใจ by the writer known by the pen name bacteria. Fans of Thai BL may recognise that pen name, because bacteria also wrote นิทานพันดาว, the novel behind the 2021 series A Tale of Thousand Stars.

Perth Tanapon Sukumpantanasan and Santa Pongsapak Udomphoch lead the cast. The official pilot also introduced an important character played by Tytan Teepprasan, who signed with GMMTV on 18 July 2026. The pilot was revealed to fans on the final day of the PERTH SANTA DEVIL'S KISS CONCERT, held on 18 and 19 July 2026 at Paragon Hall in Bangkok, and the trailer was published on the GMMTV OFFICIAL YouTube channel.