Recently, NMIXX dropped the concept photos for their upcoming fourth EP, Fe3O4: FORWARD. | @NMIXX_official/X Sullyoon, in particular garnered much attention for her hair color. While she is known to suit warm and red tones, she went for a totally unexpected color. | nmixx_official/Instagram | nmixx_official/Instagram Fans could not believe their eyes after seeing her…

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