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#1 TOP DEFINITION
In K-pop, a 'comeback' refers to when an artist or group releases new music after a period of absence — not necessarily a return from retirement. Even a group releasing a song just a few months after their last release calls it a 'comeback'.
Example
“TWICE's comeback next month is going to break records — the teaser photos alone have fans going crazy.”
#2
A scheduled release cycle in which an idol group drops new music, appears on music shows for live performances, and participates in promotional activities. Comebacks typically last 4-8 weeks and include multiple promotional events.
Example
“During comeback season, idols perform on Music Bank, Inkigayo, and Show Champion every week.”