The series faced a wave of criticism following the airing of episode 11 on 15/5, according to Korea Times. Viewers pointed out historical inaccuracies and illogical plot points within its fictional 21st-century constitutional monarchy setting.

One of the most debated scenes depicted courtiers shouting "Cheonse" (meaning "thousand years") instead of "Manse" (meaning "ten thousand years") during Lee Ahn's (played by Byeon Woo Seok) coronation. Historically, "Cheonse" was typically used by vassal states, while "Manse" symbolized a sovereign, independent nation. Critics argued this usage was inappropriate for the film's context.

The coronation scene of Lee Ahn in episode 11 - one of the film's controversial segments. Photo: MBC

Further controversy arose over Lee Ahn's coronation crown, which featured nine pearl strings. This type of crown was historically worn by leaders of vassal states, whereas kings of independent nations used crowns with 12 strings. According to Korea Herald, critics asserted these elements undermined national status, evoking Joseon Korea's historical vassal relationship with feudal China, the dynasty that inspired the production.

Another criticized detail involved the queen dowager kneeling before Lee Ahn to apologize. This act is historically inaccurate for the Joseon era, as the birth mother of a king held higher status than a prince. Additionally, the tea ceremony performed by the female lead Seong Hee Joo (played by IU) was perceived as more influenced by Chinese tea culture than Korean. Viewers suggested the production team overlooked details impacting the film's authenticity.

In response to audience feedback, the filmmakers issued an apology. On 16/5, the production unit's website acknowledged errors, stating they had not thoroughly researched the evolution of Joseon dynasty rituals and etiquette across different periods. They announced plans to promptly correct the audio and subtitles for controversial segments in reruns and on streaming platforms. Chosun Biz reported that the "Cheonse" chant was removed from episode 11 during its rerun on the evening of 16/5, which was also the day the final episode aired.

"Perfect Crown" premiered on 10/4, following businesswoman Seong Hee Joo's journey to approach Prince Lee Ahn and change her status. Beyond its two lead actors, the series captivated audiences with IU's character actively proposing to the prince and the "contract marriage" trope. However, the performances of IU and Byeon Woo Seok received mixed reviews. After the first episode, the male lead was criticized for awkward acting, unnatural pronunciation, and intonation, suggesting he hadn't fully embodied his character. IU's acting style, meanwhile, reminded viewers of her role as hotel owner Jang Man Wol in "Hotel del Luna" (2019).

Queen dowager Yoon Yi Rang (played by Gong Seung Yeon) kneels before the grand prince. Photo: MBC

Despite the negative feedback, the series garnered significant attention. According to Nielsen Korea, MBC's production recorded a nationwide viewership rating of 7,8% for its first episode, climbing to 13,8% by episode 12. The drama also attracted considerable interest in North America, Latin America, Europe, and Asia through its availability on Disney+.

IU, whose real name is Lee Ji Eun, is 33 years old and began her singing career at 15. Known for her emotive voice, she frequently topped digital music charts with new album releases, according to Pann. Korean media has dubbed her "Nation's Little Sister" and "Queen of Digital Music." She expanded into acting in 2010, making her mark in dramas such as "Dream High," "You Are the Best, Lee Soon Shin," "Producer," "Hotel del Luna," and "Moon Lovers." Last year, she impressed with her leading role in "When Life Gives You Tangerines," starring opposite Park Bo Gum.

Byeon Woo Seok, 35 years old, became a sought-after talent in Korea following the success of the series "Lovely Runner." According to Dispatch, the drama propelled him to stardom, making him a screen phenomenon in the first half of 2024. His previous works include "Flower Crew: Joseon Marriage Agency" (2019), "Record of Youth" (2020), "Moonshine" (2021), and "Strong Girl Namsoon" (2023).

Phuong Thao (according to Korea Times, Chosun Biz, Korea Herald)