The drama’s musical cues were heavily tied to the "Chakan Namja" branding. Every time a song was released on digital platforms like Melon or Mnet, the metadata had to be updated to reflect the "Corrected" title.

CD covers, digital metadata, and promotional posters had to be scrubbed of the "incorrect" spelling.

Today, if you search for the OST, you will find it under the "correct" spelling ( Chak-han Namja ), but the "Nice Guy OST Change" remains a legendary piece of trivia about the time a K-Drama tried to be edgy with its spelling and lost to the grammar police. To help you dive deeper into this drama's history:

In proper Korean, "nice" or "kind" is spelled ( Chak-han ). The production team used the phonetic misspelling 차칸 ( Cha-kan ) as a creative metaphor. It was meant to reflect the protagonist Kang Ma-ru’s journey—a man who was "broken" or a "wrongly spelled" version of a good person after being betrayed. The Legal Hammer

In a meta-twist, the drama featured Lee Kwang-soo as a character named Park Jae-gil, who was often the "truly" nice guy, contrasting with the dark tone of the music. Fans often joked that the OST change was the only "nice" thing about the show’s gritty atmosphere. The Lasting Impact

Despite the title and OST branding change, the drama remained a massive hit. Song Joong-ki’s performance cemented his status as a lead actor, and the OST—featuring tracks like by XIA (Junsu)—became iconic.