18.6 years is the sidereal period of the coincidence of the girls becoming LOONA 1/3, YeoJin, LOONA/ODD EYE CIRCLE, and lastly LOONA/yyxy. And one fate. Meeting with Fan who have recognized LOONA from even before the debut. Endless things such as these that can only be described as 'rendezvous' That is how rendezvous 18.6y becomes meaningful.
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