- BoSeo (Bo/na and Eun/seo)
- EunNa (Eun/seo and Bo/na)
- Both born in South Korea.
- They both have older siblings.
- They both have brown eyes.
- They are both vocalists.
- They can both play piano.
- Bona has black hair but Eunseo has light brown hair.
- Bona has an older brother whilst Eunseo has two older sisters.
- Bona is an actress, Eunseo is not.
- Bona was born in 1995 while Eunseo was born in 1998.
- Bona was born in Daegu whilst Eunseo was born in Incheon.
- Bona can play piano, but Eunseo can play piano, guitar, drums and tambourine.
- Bona is in the sub-units Wonder and ενύπνιον but Eunseo is in the sub-units Joy and αγύρτης.
- They are both in the group Cosmic Girls.
- They call themselves the Yeon sisters because their birth names end in the syllable "yeon".
- Bona says that Eunseo is like a little sister to her and Eunseo calls Bona her bbo.
- Bona says that she would bring Eunseo if she was stranded on a desert island because Eunseo will feed her.
- ↑ 180929 fansign - Q. What are Yeoreum and Eunseo/Bona to Bona/Eunseo cr. wuju99 Retrieved September 30, 2018.
- ↑ 181013 fansign - Q. if you went to a deserted island, which members would you bring and not bring? cr. wuju99 Retrieved October 30, 2018.
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