HaSeul (하슬) is a South Korean artist under BlockBerryCreative. She is a member of the Korean pop girl group LOOΠΔ and its sub-unit LOOΠΔ 1/3.
- Stage Name: HaSeul (하슬)
- Real Name: Cho Haseul (조하슬)
- Nicknames: Cho PD, Cho Leader, Harvard
- Birthdate: August 18, 1997
- Birthplace: Ansan, Gyeonggi Province, South Korea
- Blood Type: O
- Height: 160cm
- Weight: 45kg
- The animal she is represented by is the bird.
- The color she is represented by is green.
- She was in choir in elementary school and wanted to be an opera singer.
- She auditioned with the song "Friday" by IU and got accepted.
- She has a dog named "Hadong" which stands for "HaSeul's Dongsaeng (younger sibling)".
- She can play the guitar and the piano.
- She can speak English.