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"Flower Stained" is a medium-tempo duet and uses the imagery of a traditional beauty trick of staining nails with flowers from various plants. It compares the process of the color influsing into the nails to that of two people becoming one through the lyrics. The song is composed by Kim Hee Won.

It will be released on the 9th, following their wedding ceremony at Sheraton Grande Walkerhill Hotel, Seoul on the 8th. Part of the proceeds will also be donated to those in need.