"Melody Project Part 2" is Krystal's debut solo digital single.
In March 2010, Krystal was reported that she would appear in the Melody Project "Music Drama". She appeared in a school girl outfit for Part 1 titled "Sweet Dream" sung by Clazziquai's Alex. Now, Part 2 has been released and this time Krystal is doing the singing, the track is titled "Melody (Moderato)".