Baek So-hyun (Korean: 백소현, born November 18, 1996), known professionally as Seori (Korean: 서리), is a South Korean singer-songwriter under the label ATISPAUS. She made her solo debut on May 12, 2020, with the extended play ?Depacse Ohw (2020). Prior to her official debut, she often uploaded song covers to YouTube, because she wanted to see how her voice was received by others.