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The single has been released under Lee Hwan Hee's name for it's said that she is the center of the group. As this is the case and the trio is also described as a dance unit, it is presumed that Lee Hwan Hee will be leading as the singer of the group and the other members will provide backup vocals and bring the performance to life as dancers. 

Her agency previously mentioned regarding the release, "New album 'Tonight' is an electronic track which showcases Lee Hwan Hee's emotional voice and her harmony with the two new members... This new single which expresses a couple's pending breakup once the night is over, features rap making by 'Show Me the Money 2's rapper Heo In Chang, and DJ 2E LOVE composer Choi Hee Chan as producer."

So give it a listen below!