Baek Ji-heon, known mononymously as Jiheon, is a South Korean singer and lyricist under ASND. She is the maknae of the girl group fromis_9, formed through the reality survival show Idol School (2017). Baek Ji-heon, known mononymously as Jiheon, is a South Korean singer and lyricist under ASND. She is the maknae of the girl group fromis_9, formed through the reality survival show Idol School (2017).