On January 4, tvN's 'Life Bar' welcomed diva star Uhm Jung Hwa to the show, where she discussed working with Lee Hyori for "Delusion".

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She shared, "I thought it would be nice to perform a duet from the start and envisioned a stage where two people converse together... I wanted to work with someone who knew how to create a fancy stage.   really liked Lee Hyori as a singer. When I requested the duet to her, she responded in less than a second, saying 'Okay, unnie. I've been itching to perform anyway.'"

Uhm Jung Hwa also added, "When I went to record, they told me that Lee Hyori had come an hour earlier. So I went to see her in the next room and she was deep in meditation with a candle lit in the dark."