Last year there were so many hit songs with massive longevity - Rough, TT, Cheer Up, Playing with Fire, Decalcomanie etc. These songs charted for 50 weeks on average each. But this year no idol group song has shown such longevity. The only idol group song that have shown signs of longevity so far is Really Really. Red Flavor and AIIYL are charting well right now, but will they be able to show the same kind of longevity? No song has even crossed the 1.5M mark yet. And non-idol acts like AKMU, IU, BB4 and Yoon Jong Shin are dominating this year. Thoughts??