After a 10 month hiatus, Kara returned with 2 new members 17-year-old Goo Hara and 14-year-old Kang Jiyoung, replacing Kim Sunghee who left for educational purposes. They promoted the song in the music shows KBS's Music Bank, MBC's Show! Music Core, SBS's Inkigayo and Mnet's M! Countdown. A new version of the song "Good Day" called "Good Day: Season 2" was released on October 13, 2008 as a digital single. A remix version of the song "What's This" entered in the special edition of the group's second EP "Pretty Girl".
Track List :
2. Baby Boy
3. What's This
4. Good Day
5. Wait
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