- ChengSeo (Cheng Xiao and Eun/seo)
- JuXiao (Ju/yeon and Cheng Xiao)
- ChengYeon (Cheng Xiao and Ju/yeon)
- They both have brown eyes.
- They were both born in 1998.
- They are both members of Y-Teen.
- They both have a sister.
- They both attended SOPA.
- They are both in the sub-unit αγύρτης.
- Eunseo has two older sisters but Cheng Xiao has a younger sister.
- Eunseo was born in Incheon, South Korea but Cheng Xiao was born in Shenzhen, China.
- Eunseo has light brown hair but Cheng Xiao has black hair.
- Eunseo is in the sub-unit Joy but Cheng Xiao is in the sub-unit Wonder.
- Cheng Xiao was a mentor on Idol Producer but Eunseo is not.
- They are both in the group Cosmic Girls.
- When they went to Shanghai for M Countdown in 2016 they shared a room together and Eunseo has a polaroid of Cheng Xiao as a memory of that.
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