OPPO is mostly known for more conventional smartphones such as the Find X3s and Renos of 2021. However, it also had more interesting units in its history, not the least of which were the N-series phones with main cameras that could twist around to face either the front or back of the device. According to an eminent Weibo leaker, they are now on their way back and might be here soon.
https://www.notebookcheck.net/OPPO-will-resurrect-the-innovative-360-cam-N-series-of-smartphones-soon.556641.0.html