Gap: The Series (Thai: ทฤษฎีสีชมพู; RTGS: Thritsadi Si Chomphu; lit. Pink Theory) is a Thai romantic comedy television series that premiered on Channel 3 and the IdolFactory channel on YouTube on November 19, 2022, and ran until February 11, 2023.^[1][2] It stars Sarocha Chankimha and Rebecca Patricia Armstrong.^[3] Adapted by Devil Planoy (เจ้าปลาน้อย) from the novel of the same name, it is directed by Nuttapong Wongkaveepairoj, and produced by IdolFactory. The series surpassed 600 million views on YouTube within one year of its release. Now 900 million ^{[citation needed]}

Gap: The Series is Thailand's first "girls' love" series,^[4] and became one of its most popular television shows.^[5]

Ever since Sam (Sarocha Chankimha) came to her aid years ago, Mon (Rebecca Patricia Armstrong) has always considered the former as her role model. When Mon graduates, she decides to apply for a job at Sam's company, yet Sam's distant and icy exterior surprises her. The closer Mon gets to Sam, and the more of Sam's barriers she breaks, the more Mon's feelings gradually change from idolizing to love and Sam's world becomes brighter. However, between them lie many obstacles such as gender barriers, the 8-year age gap, company rules, and social class, as Sam is a descendant of royalty.^[6]

Gap was announced as the first GL series in Thailand. The project was launched on August 22, 2021, along with the main cast confirmation.^[8] Casting to find other actors for supporting roles was held on November 13, 2021.^[9]

After the release of the pilot trailer on May 14, 2022, the series received negative feedback on social media.^[10] The production team had to readjust the script and costumes, in addition to making changes to shooting locations, which prompted filming to be postponed until June 20, 2022. Filming finally wrapped up on October 22, 2022.^{[citation needed]}

Eventually, the show's final and improved product received an overwhelmingly positive response, which led to Freen and Becky receiving multiple awards, having their own world tour, and confirmation that they will star in more GL projects such as Uranus2324 and The Loyal Pin.^{[citation needed]}