The best replacement for b2st is mblaq.

The best alternatives to b2st are rated as following:
★★★★★  mblaq
★★★★★  shinee
★★★★  2pm
★★  beast

Your alternative for b2st is not listed? Suggest!
Speaking about b2st, one probably shouldn't forget about 4minute.

Other search terms related to b2st and their ratings are:
★★★★★ 4minute
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Google Trends

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b2st
mblaq
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