Lee Il-hwa's role as Seung Si-won's mother was originally supposed to be cast to actress Kim Seung-ryung, but it didn't happen due to scheduling conflicts.

Famous real-life celebrities were used as fan crushes for the protagonists, with H.O.T member Tony Ann and Moon Hee-jun playing roles in special scenes reflecting their obsession as idols in the series.

When it aired, the series faced heavy criticism because the main roles were cast with inexperienced actors, including a member of an idol group and a talented person from a singing competition program, but their performances later exceeded expectations and received widespread praise.

Baseball broadcaster Cho Shin-soo played a high school student bearing his real name in the eighth episode, and he is indeed the real brother of baseball player Cho Shin-soo.

The story takes place in Busan in the late 1990s and heavily relies on the nostalgic atmosphere of the Korean pop groups H.O.T and Seo Taiji and Boys, which were symbols of that era.

Despite a 15-year time gap between the past and present events in the series, separate actors were not used to portray the characters during childhood and adulthood; instead, the same actors relied on makeup and costume changes to embody the different life stages smoothly without any jarring inconsistency.

The series achieved record viewership ratings, making it the highest-rated drama produced for cable channels in South Korea until 2012, and sparked something like a public craze throughout its airing period.

The series was directed jointly by director Shin Won-ho, who had previously directed works such as Old Miss Diaries and Happy Sunday, and director Park Seung-jae.