In the beginning of 2020 the first rumors of JSN Entertainment going to debut their first group began to spread. While some were convinced that it would be a boygroup others swore it would be a girlgroup. Many rumors spread about the possible line-up, especially since many trainees were already known to the fans though jsn's trainee program, JSN Fam. The Entertainment remained silent while the gossip grew louder. It wasn't until October 2020 when the first teaser images and the first teaser introducing Lui were posted that the rumors of a boygroup were confirmed. Apollo officially debuted on January 15, 2021 with their single "Delphi" after several trailers and predebut content were released.

​

A stressful time was awaiting the young group but by promoting their song on several music shows they successfully gathered a fanbase around them. And their work didn't stop after the release of "Delphi". In May and June 2021 they held their first comebacks with their songs "maze" and "Enigma". In August 2021 the new rumors that had started to spread were confirmed: the girls that could be seen in the MV of "maze" and "Enigma" and now in teasers posted on a new youtube channel were the members of the girlgroup JSNE was rumored to debut.

Artemis was introduced as sister group of Apollo on August 10th making their officially debut with their first single "Blue Moon" on September 26, 2021.