Display More2016 i kind of not agree with PWF, it was popular but way way lower success than the other 3. Actually Whistle did at least as much as PWF in 2016. Also BST by BTS could have a shot at making the list, Navirella too but imo Fxxk It by Big Bang totally dominated the end of the year and should be here too.
2017 : If you talk about national hit, signal and Ko ko bop did better than AIIYL, and I WIll go to you like the first snow is a big miss from that year, as its arguably Ailee's biggest song in Korea. IU's Palette was also a good success.
Fine by Taeyeon also should have been here. Really Really is very arguable.
2018 : IU Bbibbi did much better than you think, and did better than DTNA, Idol and BB. Solo shouldn't be here if Bbibbi isn't imo. Travel by Bol4 was very big during end spring early summer. Flower Road by Big Bang also dominated the beginning of the year. Fake Love should be here, as it did pretty much as good as Idol. Also Siren smh.
2019 : I would tend to agree on that one, though Dalla Dalla and Gotta Go could've been here. AKMU's How Can I Love the Heartbreak, You're the One I Love was an absolute national hit and should be here. If you count songs that got success in 2020, Psycho, Hip, Meteor should be here. Also Blueming which is arguably as big as BWL.
2020 : How tf did you miss Any Song lmao. Also Eight by IU (you should always check IU's realeases when doing those lists as she is alwasy up there). Also SSAK3's Beach Again. VVS is also killing it this end of the year. Aloha also did amazing as an ost. Start Over by Gaho also could've been here. Dolphin and Nonstop...
PWF wasn't quite as big as those three in some regards, but it spent more weeks in the upper half of the charts than any of those three songs did, 41 weeks to be exact. TT spent 44 weeks in the top 100. It fell hard once it left the top. There are many measures of success, and you're only looking at one it seems.
Signal flopped after like two weeks, and Kokobop had no longevity overall. AIIYL has the record for most weeks in the domestic Gaon top 100, and is the ONLY girl group song to manage to make the streaming chart on Gaon in 5 straight years. The song is really paid dust for being the GG song with the best longevity.