Red Light and 4 Walls are albums from F ( x ) released in 2014 and 2015 respectively .
The group 's third and fourth albums , Red Light ( 2014 ) and 4 Walls ( 2015 ) , were commercially successful and well-received by music critics.f ( x ) has been recognised for their experimental style and eclectic , electropop-based sound .
F-LRB-x-RRB- -LRB-group-RRB-