1NB (원앤비) was a five-member girl group under Trivus Entertainment. They released their pre-debut single “Stalker” on February 6, 2017. In August 2017, it was confirmed that members Leeda and Ha Jung will appear in KBS’s rebooting show The Unit. They officially debuted on November 29, 2017 with the single “Where U At”. The group announced on April 27, 2018 that they have disbanded.
Their name stands for “1 New Best”.
Source: kpop wiki