Omg is this harem? Can someone tell me the pairing? By using their head colors

I don't think it's harem. Sulwon (black hair, protagonist) is paired with Chul soo (white hair). Purple hair is straight and I think his pairing is the white hair girl. The other two currently don't have pairings.

Black hair dude x White hair dude
Purple x White hair girl (sis of white hair dude)
High school student nobody
Brown (dark) hair has a crush on black hair dude
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