 In August 2017, actress Bae Geu-rin joined Maroo.In May 2018, Maroo debuted former The Ark member Euna Kim and Minju as duo, KHAN.Later that month, Norazo member Jo Bin joined Maroo.In August 2018, Norazo making comeback under Maroo after added new member Won Heum.In September 2018, Maroo announced that BONUSbaby member Kongyoo would leave the group to focus on her studies and then the group decided to take hiatus.