The best replacement for 4minute is sistar.

The best alternatives to 4minute are rated as following:
★★★★★  sistar
★★★★★  2ne1
★★★  f(x)
★★★  miss a
★★  after school
★★  secret
★★  kara
★★  t-ara

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

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

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4minute
sistar
2ne1