I Told Sunset About You / I Promised You the Moon (known in Thai as แปลรักฉันด้วยใจเธอ; RTGS: Plae Rak Chan Duai Chai Thoe, lit.

Part 1, I Told Sunset About You, follows the relationship of Teh and Oh-aew, schoolboys living in Phuket who used to be childhood best friends but had a falling out and have not spoken for several years.

Starting out as rivals, they eventually make up and begin rebuilding their relationship as Teh helps tutor Oh-aew for their upcoming Chinese exam.

They grow closer, forming a new bond that begins to extend beyond friendship but also tests their relationship as Teh struggles to understand and deal with his feelings.

[1] Part 2, I Promised You the Moon, explores the development of Teh and Oh-aew's relationship as they adjust to life as university students in Bangkok, with Teh becoming involved in the Drama Club at his university and meeting older fellow students Jai, Khim and Top, while Oh-aew makes a new group of friends including Q, Plug, Maengpong and Auu.

A side couple from that series, played by Putthipong and Krit, had attracted a large fanbase, especially among shippers, and My Ambulance director Naruebet Kuno, in response to audience feedback, briefly considered featuring them in a sequel, but abandoned the idea as it could not be fitted into the earlier story.

[2] He presented the idea to Nadao producers and executives Songyos Sugmakanan and Kriangkrai Vachiratamporn, who agreed that a simple coming-of-age story would make a refreshing change of pace from the fantastical My Ambulance.

[3] The series was developed as part of what Nadao termed the "BKPP Project", an integrated promotion plan centred on the two actors and codenamed after their nicknames, Billkin and PP.

He invited Karakade Norasethaporn and Naron Cherdsoongnern, both of whom he had worked with as fellow students at the Faculty of Communication Arts of Chulalongkorn University, to develop the screenplay with him.

[5] As is often Nadao's approach, the writers interviewed the lead actors to aid the development of the script, partly basing the characters on their personalities and taking inspiration from their experiences.

[5][7] Several food items are featured in the story, including the Hokkien noodles sold by Teh's mother and the dessert o-aew, which inspired the name of Krit's character.

[5] The writers saw the series as first and foremost a coming-of-age story, and created a character-driven narrative focusing on the characters' internal conflicts, having them questioning and learning to understand their own feelings through experience.

A first read-through was held with lead actors Putthipong and Krit via Zoom video call on 24 April, after which some further refinements continued, totalling about 5+1⁄2 months of screenplay development.

[5][6][10] The series entered pre-production under isolation conditions, with the crew holding online meetings where each department presented their work via video conference.

Parada Thitawachira, a TV actress and singer, was invited to audition for the role after the crew came upon a Facebook video of her rapping to a popular song in the dialect, and was promptly chosen.

[15] On the other hand, the crew had difficulty filling the role of Bas until Songyos suggested auditioning Pongpol Panyamit, who had earlier been recruited to Nadao Academy, the company's recently launched talent development project.

[13] The roles of Teh and Oh-aew's friends Kai, Phillip and Mod were filled by teen actors Jirayus Khawbaimai, Theethat Suk-im and Christiaan Churaporn Bos, respectively.

[2] Filming was highly subject to weather conditions, as it took place during the rainy season, frequently necessitating impromptu changes to the shooting schedule, managed by line producer Patcharaporn Liewpairoj.

[20][22] Tawanwad worked with Naruebet to produce their shared vision of a visually cinematic piece, and used warm lighting to accentuate the tones for the scenes, most of which employed a colour palette highlighting the primaries red, green and blue, which was also factored in the costume and art design.

[2][23] (Teh and Oh-aew are represented in large part by the colours blue and red, respectively, which were expressed through clothing prepared by costume designer Chayanuch Savekvattana, who was working with Nadao Bangkok for the first time.

)[24] As the series entered editing in August, Naruebet found the emotional arc in some scenes to be lacking, and the story hard to follow in places.

Following modification of the screenplay and further workshopping by the actors, the crew spent another two weeks in September reshooting in Phuket, during which music videos for the series' several songs were also filmed.

Newly introduced cast members include Oabnithi Wiwattanawarang, part 1 writer Arachaporn, and Naphat Vikairungroj as Teh's fellow students Jai, Khim and Top; and Kamolpipat Bunnag, Sarit Trilertvichien, Taninrat Wadsriwat, and Chayapak Tunprayoon as Oh-aew's friends Plug, Maengpong, Q and Auu.

They were also made available with English and Chinese subtitles outside Thailand via Vimeo On Demand, for a per-episode rental fee, initially set at US$12 but later reduced to $5.99 for subsequent episodes.

[37] The series has also received local distribution in a few other countries: the Philippines (Part 1 being dubbed in Filipino) via the streaming platform POPTV,[38] Taiwan via Line TV,[39] and Japan on Wowow Prime.

Part 1 of the series received enthusiastic responses from viewers, with associated hashtags becoming the top trending item on Twitter in Thailand during each week's release, as well as globally for later episodes.

[48] It was also popular internationally, with significant followings in Vietnam, Japan, Myanmar, Indonesia, Malaysia, and especially in China, where it rose to the top-rated list on the review website Douban with an aggregate rating of 9.4 out of 10.

[49][50] Feedback for the series was highly positive, with praise given for the acting and chemistry between the two leads, as well as the cinematography, which effectively conveyed the charms of the Phuket setting.

[59] The Phuket Tourist Association noted that the series contributed to a substantial increase in visitors especially to the Old Town area and Phrom Thep Cape, which served as major filming locations.