Differences from Manga version
- In the manga, the characters are in high school in season 1, but F4 (minus Domyoji) attend Eitoku University in season 2. In the Korean version, the characters are also in high school, but the F4 move on to Shinhwa University from episode 13 onwards. Shinhwa High School and Shinhwa University are located within the same campus.
- The relationship between the two characters Sojiroh and Yuki (Yi Jung and Ga Eul in the Korean version) is merely hinted. In the Korean version, their relationship gradually develops throughout the series, having their own significant plotline instead of acting as a subplot.
- Ji Hoo has a more significant role in Jan Di's life than the Taiwanese and Japanese versions, more strongly depicted as a romantic companion for most of the drama.
- Woobin's family does not appear in this version, nor is he only interested in older women.
- How Jan Di came to attend the same school as F4 is changed completely. In the manga and Japanese version, Makino had admired Shizuka Todo being a student there, and worked hard to be accepted. Yet in the Korean version, Jan Di saves a student from committing suicide while delivering laundry (her family owns a dry-cleaning business), and she is given a scholarship to the school. Jan Di was also initially reluctant to attend, but complied because of the school swimming pool, another trait absent from the manga.










