- EunA (Eun/seo and Seol/A)
- HyunYeon (Hyun/jung and Ju/yeon)
- JuJung (Ju/yeon and Hyun/jung)
- EunSeolA (Eun/seo and SeolA)
- They were both born in South Korea.
- They are both members of Y-Teen.
- They both have brown eyes.
- SeolA has silver hair but Eunseo has brown hair.
- SeolA was born in Seoul but Eunseo was born in Incheon.
- SeolA was born in 1994 but Eunseo was born in 1998.
- SeolA is a lead vocalist but Eunseo is a sub-vocalist.
- Eunseo can play piano, guitar, drums and tambourine but SeolA can't.
- SeolA is in the sub-units Sweet and ενύπνιον but Eunseo is in the sub-units Joy and αγύρτης.
- They are both in the group Cosmic Girls.
- They are the energy vitamins of Cosmic Girls.
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