Minimally invasive spine surgery (MISS) has been rapidly developed in the last three decades to reduce damage to normal spinal structures during surgical procedure and improve patients’ functional outcomes with early return to normal life [1]. Unilateral biportal endoscopy (UBE) is a new minimally invasive technique for spinal disease. It has received a lot of attention in the last few years, especially in South Korea [2, 3]. UBE technique is expanding from an interlaminar ipsilateral approach to an interlaminar contralateral approach, a paraspinal approach, a posterior cervical approach, and cord-level decompression with favorable outcomes [4].