It's Son Sungha, part of original lineup who was supposed to debut.
Since Erin and Sam were absent during performances from photos above, she should be another rapper.
Source: 9muses (1 2 3)
Source: M2 & WEi
GHOST9 "NOW : Where we are, here] ‘SEOUL’" Performance Teaser # 2 G-reyish "M" Yeso MV teaser WOODZ "Set" Concept pics WOODZ(조승연)…
source: The K-POP 1 2
Source: M2 & WEi
GHOST9 "NOW : Where we are, here] ‘SEOUL’" Performance Teaser # 2 G-reyish "M" Yeso MV teaser WOODZ "Set" Concept pics WOODZ(조승연)…
source: The K-POP 1 2
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