Semantic Error (시맨틱 에러)

Semantic Error (시맨틱 에러) is a South Korean campus romance property that began as a Boys' Love (BL) web novel by Jeo Soo-ri (저수리) and was adapted into a webtoon, an animated series, a live-action drama, and a theatrical film. The title borrows a computer science term for a logical error in a program, and the story follows Chu Sang-woo, a rigid computer science student, and Jang Jae-young, a free-spirited visual design student, whose collision over a university group project turns into romance.^{1 • 2}

Origin as a web novel

The story first appeared as a web novel serialized on RIDI Books, the e-book platform of the Korean content company RIDI. It won the 2018 RIDI Books grand prize in the BL novel category, an award the publisher cited as evidence of both its quality and its public attention when announcing the drama adaptation.¹ A 2022 industry timeline compiled from Korean market data dates the novel's serialization to 2017–2018 and notes that the novel was released in two versions with different maturity ratings, 19-and-over and 15-and-over.³

The premise places two opposite personalities in a shared liberal arts group project. Chu Sang-woo, a computer science junior who values rules and routine, finds that his teammates have left him to do all the work, so he removes their names and presents the project under his own. One of those names belongs to Jang Jae-young, a popular design senior whose plans to study abroad are jeopardized, and his pursuit of revenge forces the two into repeated contact.^{4 • 10} A Weverse Magazine essay on the series argues that part of its appeal lies in how ordinary the characters' gap is: both are university students of the same generation, so their conflict grows from a familiar campus grievance rather than from the extreme differences in power or wealth common in BL fiction.²

The property expanded steadily before reaching television. A webtoon adaptation launched in 2020, and a special animated version was released through the streaming service Laftel in 2021; an audio drama had also been produced.^{1 • 3}

The Watcha drama

The live-action version was a Watcha original produced by Raemongraein and AXIS, written by Jason and directed by Kim Soo-jung, with eight episodes of about 25 minutes airing twice weekly from February 16 to March 10, 2022.^{4 • 5} The two leads were both former idols: Park Seo-ham from the group KNK and Park Jae-chan from DONGKIZ, and both were promoting as singers when they were cast.^{5 • 11}

Adaptation choices. The drama softened the source material for a general audience: while the original web novel is rated R, the drama was rated 12 and above in Korea.¹² A Korean academic study of the adaptation notes that removing the novel's adult content transformed it into content suitable for ages 12 and older, a change it identifies as a point of debate in discussions of BL's popularization.¹³ Screenwriter Jason said in an interview that the key creative staff, including the writer, director, planning and production executives, and Watcha's production and marketing leads, were all women with a strong understanding of the genre as both creators and consumers.²

Commercial gamble. For Watcha, the series was its first original production and a deliberate bet on an under-represented genre. The platform, founded in 2011 and ranked seventh among Korean streaming services with about 1.23 million monthly active users in April 2022, was struggling to climb the market rankings against larger competitors.¹² The bet paid off on the platform's own charts: the series was first on Watcha's weekly popularity list for eight consecutive weeks after its premiere, and the Korea JoongAng Daily reported in June 2022 that it still ranked in the platform's top two.^{6 • 12} Yonhap described it as the first original content made by a Korean streaming service that depicts gay romance and centers the relationship between two male students.⁶

The production team stated during the run that the series would have a closed ending, and no second season was planned; lead actor Jaechan said in a 2022 interview that he would return for a second season if it were possible.¹¹

Reception and cultural impact

The drama's popularity lifted its leads to wider fame among Korean drama fans, with clips from the show drawing hundreds of thousands of views on YouTube, and preorders of the published screenplay ranked first on the weekly sales list of the online bookstore Yes24 in the fifth week of April 2022.⁶ The effect flowed back to the source: RIDI reported that after the drama's teaser event, sales of the original web novel and webtoon grew by more than 200 percent and 185 percent respectively, and a Korea Creative Content Agency industry report recorded a 916 percent increase in transactions of the original web novel on RIDI during the first half of 2022.^{1 • 14} A Kyobo Bookstore year-end trend report credited the franchise, spanning novel, webtoon, drama, and film, with leading the popularization of BL content in Korea, and noted that a Semantic Error photobook was prominent among online bestsellers.¹⁵

Scholarly and industry commentary placed the series in the context of Korean BL's growth. Yonhap reported that the drama's success prompted RIDI to greenlight another BL web novel adaptation, The New Employee, for Watcha.¹⁶ Academic work analyzed its distribution strategy, including how the leads' social media activity created a "double relationship" between the fictional characters and the actors that generated additional fan narratives.¹⁷ A University of Georgia conference paper described the series as challenging heteronormative structures within and beyond the genre while providing queer representation for Korean and transnational audiences.¹⁸ Marie Claire later ranked it among the best Korean BL dramas, noting that it was one of the first Korean BL series to receive longer episode runtimes and used the space to build an enemies-to-lovers arc.¹⁹

Film and later adaptations

A theatrical version, Semantic Error: The Movie (시맨틱 에러: 더 무비), compiled the series with additional footage and was released in South Korea on August 31, 2022. Directed by Kim Soo-jung and produced and distributed by WATCHA, it ran 177 minutes, was rated 12, and sold 62,204 admissions across 57 screens, with international sales handled by KT StudioGenie.^{7 • 9} KOBIS data record a gross of ₩692.5 million.⁹ The film also opened in Taiwan, Hong Kong, Vietnam, and Singapore.²⁰ It screened at the Bucheon International Fantastic Film Festival and in the Hearts Attack! section of the 2022 Hong Kong Asian Film Festival.⁷

The animated version also reached Japanese theaters: a four-episode short anime adaptation, produced in 2021, was screened alongside the two-part Japanese theatrical release of Semantic Error: The Movie beginning January 12, 2024, with voice actors Junya Enoki and Toshiki Masuda, who also dubbed the live-action film for Japan.²¹ In Japan, the Watcha drama had been streamed exclusively on WATCHA from March 17, 2022, two episodes per week.²²

Awards. At the 2022 Blue Dragon Series Awards, Park Jae-chan and Park Seo-ham both won the Popular Star Award, and both were nominated for Best New Actor.⁸ Park Jae-chan received the New Wave Award at the 2022 Grand Bell Awards, while Park Hae-il won Best Actor for Decision to Leave.^{9 • 23}

References

1. RIDI Corporation press release: 리디, 인기 웹소설 '시맨틱 에러' 왓챠에서 드라마로 본다 (February 15, 2022)
2. Weverse Magazine: 시맨틱 에러
3. 하나증권 자료: 시맨틱 에러 미디어 믹스 타임라인 (2022)
4. KoreanDrama.org: Semantic Error
5. News1: 박서함 "예뻐하던 후배 박재찬 '시맨틱 에러'로 재회…신기" (February 10, 2022)
6. Yonhap News Agency: Queer web series gain popularity on streaming platforms (April 29, 2022)
7. Korean Film Council (KOFIC) film database: Semantic Error (2022)
8. IMDb: Semantic Error (TV Mini Series 2022) – Awards
9. Korea Film: Semantic Error (시맨틱 에러: 더 무비), KOBIS data
10. Apple TV: Semantic Error: The Movie
11. NME: DONGKIZ's Jaechan says he would return for 'Semantic Error' season two if possible
12. Korea JoongAng Daily: Watcha takes a gamble with 'Semantic Error,' a BL series (June 13, 2022)
13. AccessOn journal article on the drama 시맨틱 에러 and BL popularization (2025)
14. Korea Creative Content Agency: 2022년 웹툰 사업체 실태조사보고서
15. Kyobo Bookstore: 2022 분야별 판매동향
16. Yonhap News Agency: BL 인기에…리디 '시맨틱에러' 이어 '신입사원'도 드라마 제작 (May 23, 2022)
17. Mokwon University, 지식과 교양 Vol. 12: OTT BL 콘텐츠의 대중화 전략 및 수용 특징 연구
18. University of Georgia Grady College: BL Meets K-Drama: Semantic Error Redefining Queer Visibility in Transnational Spaces
19. Marie Claire: The 13 Best BL K-Dramas of All Time
20. Honam University research material on 시맨틱 에러 adaptations
21. 映画.com: セマンティックエラー（短編アニメ版）
22. WATCHA Japan press release (PR TIMES, 2022)
23. Decision to Leave Won Best Picture at the 58th Grand Bell Awards

Topic: Encyclopedia › Arts and culture › Screen and stage › Film and television › Series and fictional screen worlds › International serial drama and telenovelas › East Asian drama series › Korean contemporary drama › Romance and melodrama series › Romance melodrama miniseries › Romantic comedy series › Youth and campus romance series

Initially written Oct 3, 2026 · Reviewed: Oct 25, 2026 · Edited: Oct 15, 2026; Oct 25, 2026 · Last review: Oct 25, 2026

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