What groups write their material? I know BlockB and B1A4 do.
Oh you talk about the twin/rival groups
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MBLAQ (their last album MASTERPIECE ), BIGBANG (all of them can write, compose and produce), U-KISS (write some songs here and there), SHINee (I think), 4MINUTE, CL, WINNER, Bom, EXID, After School (can write too I think), MAMAMOO (but they are rookie so they co-write only, MoonByul actually wrote 100% of the words she raps).
MBLAQ (their last album MASTERPIECE ), BIGBANG (all of them can write, compose and produce), U-KISS (write some songs here and there), SHINee (I think), 4MINUTE, CL, WINNER, Bom, EXID, After School (can write too I think), MAMAMOO (but they are rookie so they co-write only, MoonByul actually wrote 100% of the words she raps).
MASTERPIECE 
), BIGBANG (all of them can write, compose and produce), U-KISS (write some songs here and there), SHINee (I think), 4MINUTE, CL, WINNER, Bom, EXID, After School (can write too I think), MAMAMOO (but they are rookie so they co-write only, MoonByul actually wrote 100% of the words she raps).
