I just want to make a circle. Very simple hairstyle.

Tell your stylist to divide the back hair area (with the head rotation as the center point and the middle points of the ears) into two areas, from the hairline to the golden section 3/ 1, and cut an equal length level (called back), and then put down the rest of the hair for discontinuous haircut (this area can be cut at a low level of 45) to form the roundness you want.