gugudan oguogu (Hangul: 구구단 오구오구), or simply oguogu is the first sub-unit of South Korean girl group gugudan (구구단). The duo is composed of the group's youngest members, Mi-na and Hye-yeon. They debuted on August 10, 2017 with the digital single ICE CHU.
The unit's name oguogu is taken from the numbers each members represent in gugudan (multiplication table), with Hye-yeon being number 5 (o) and Mina being 9 (gu).
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