Teaser 이달의 소녀 (LOONA) "X1X"
Teaser 이달의 소녀 (LOONA) "XIIX"
Teaser 이달의 소녀 (LOONA) "XIIIX"
Teaser 이달의 소녀 (LOONA) "XIVX"
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In the XIIX teaser, Go Won is seen wandering around the same plane that HaSeul was in the "Let Me In" M/V. This would make sense, as on the mobius strip, LOONA 1/3 and yyxy are mirrored, and the two girls were both to be the 3rd girls to be revealed in their unit.[citation needed]