HeeJin (Korean: 희진; Japanese: ヒジン; Chinese: 姬振) is a South Korean singer and lyricist under MODHAUS. She is a member of the girl groups ARTMS, LOONA and its first sub-unit LOONA 1/3. She is also a former member of the virtual girl group Feverse under the name Rien (리엔). She made her solo debut on October 5, 2016 with the single album "HeeJin".