I. Introduction
Happy Ending is the debut mini album by DIA.
It was released on June 14, 2016 by MBK Entertainment and distributed by interpark.
It consists of seven tracks, including "On The Road", released as the EP's title track.
This marked the return of members Heehyun and Chaeyeon, after their hiatus in order to participate in Produce 101.
It also marked the first release without member Seunghee and the first release with member Eunchae.
II. Commercial Performance
Happy Ending debuted and peaked at number 7 on the Gaon Album Chart on the chart issue dated June 12–18, 2016, achieving a new peak for the group, as their debut album peaked at number 11.
The EP also debuted at number 24 on the chart for the month of June 2016, with 4,820 physical copies sold.
The EP sold 9,474 physical copies in 2016.
III. Tracklist
1. Happy Ending
2. On The Road
3. The Trainee
4. Waiting For You (Yebin solo)
5. Remember (Eunchae solo)
6. Waiting For You (DIA version)
7. On The Road (instrumental)
IV. MV and Album Tracks
