"Goodbye" (안녕) is the final digital single by 2NE1. It was released on January 21, 2017.
CL revealed that the song was originally written for past member Minzy. She re-wrote them later to make them a message to Minzy and their fans as well. The song was also meant to be part of CL's U.S. debut album.
- It's the first and last song sung by the group as a trio.