Baek Seung Ryeol, known professionally as PAIIEK, is a South Korean singer, musician, and member of BAND NAH (나상현씨밴드). He graduated from Hanyeong Foreign Language High School and later obtained a double bachelor's degree in French Language and Literature and Political Science from Yonsei University and a Ph.D. in Convergence Science and Technology from Seoul National University. Before becoming a member of BAND NAH, he used to be part of other bands such as SICHETMALO, AFTER THOUGHTS, among others, as the guest vocalist and bassist. In July 2014, he joined BAND NAH and re-debuted as the bassist with the single "Late Dawn". The band usually performs in rock festivals or open-air concerts but has occasionally participated in TV shows such as "Vocal Play 2" or "Great Seoul Invasion". They are represented by January (재뉴어리). He made his debut as a solo artist in June 2018 with the single "Madeleine", featuring Park Hyun A.