Red Velvet came back after 1.5+ of hiatus, a top 3 3rd gen gg no less, and they havent even hit top 5 melon daily during the first week, under a supposedly more favourable melon system.
The song will for sure rise when the promotions start and it could still end up as a hit, but it shows how little hiatuses matter to a song's performance at the start, unlike what everyone thinks