5TAR (Incompletion) is a special digital single by A.C.E. It was released on March 15, 2018 as a thank you song for their fans.
The single did not include Chan at the time as he was preparing to debut in the project group UNB. However, a live video of the song featuring all the members was released on April 20, 2018.[1] The complete version of the song is included in their first mini album Under Cover as a CD only track.
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