- HaVi (Ha/Seul and Vi/Vi)
- Both have brown eyes.
- Both are part of the sub-unit LOONA 1/3.
- When debuting, ViVi had her hair dyed pink, whereas HaSeul kept her natural brown hair.
- ViVi is older.
- HaSeul can speak English, whereas ViVi cannot.
- ViVi can speak Chinese, whereas HaSeul cannot.
- They are in the band LOONA.