Koo released her 5th digital single "Happy", which is also a remake to Seo In-guk's song "Were We Happy"
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Koo released her 5th digital single "Happy", which is also a remake to Seo In-guk's song "Were We Happy"
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-19 from Wikipedia. The archived copy is preserved so this citation survives link rot.