While many have celebrated NewJeans' return, a number of fans have called for a boycott, rallying behind the message: "NewJeans is five."

One fan wrote: "NewJeans is five, not four. You can’t have a rainbow without the sun."

Nonetheless, the newly released videos and photos have drawn millions of views and likes in under 12 hours.

In a statement to South Korean media outlets, Ador said that Tuesday's videos and photos are "commemorative content produced for fans to enjoy together in celebration of the fourth anniversary of NewJeans' debut".

It added: "We plan to announce NewJeans' specific activity plans and format once discussions with the members have been fully concluded."