There's no way to know that. It also could have flopped.
*shrugs* Do you think peoples tastes for music would have changed between Nov-Mar, 5 months? I doubt people would have thought the song was less appealing if it was released 5 months later, the general public liked the song because of the lyrics and the sound, they also like the dance too. Plus it's still in the Top 100 in Gaon almost a year after it was released so I think it would have been fine no matter when it was released.