The Korean music industry is fierce; rife with competition. With so many idols and idol groups making debuts and comebacks all at once, it's hard to maintain your place on the music charts.
Which makes it all the more impressive, knowing that BTOB's single 'Missing You' has stayed in the top 10 of every major music chart (The highest being 5th place on Melon) for nearly a month. 'Missing You' being a ballad, makes the feat even more laudable. Turns out fans would miss BTOB so much that they refuse to let them drop out of the top ten.
BTOB has grown a great deal over the years, and it's good to see that they have strong staying power even amongst other juggernauts on the charts.