Throughout the video, the scenery used subtly displays a story of which someone is holding a concert for a former lover, confessing love and re-committing themselves to each other. Unlike previous promo singles from Super Junior, "Marry U" is a mid-tempo ballad, and the song does not require extremely difficult dance choreography like what the group's previous singles required. In the first half of the music video, Super Junior is mainly shown sitting on high platforms singing to the song, with shots of the girl and also scenery composed of CG artworks. At the end of the video where the girl sits down to enjoy the group dancing, the group dances in a fantasy-like surrounding, with slow and gentle choreography. The ending scene shows the girl smiling and nodding, a diamond ring glinting on her finger.
