Only One was released on May 27, 2000, becoming Shinhwa's third album. The album was delayed three months to give SM Entertainment's new group at the time, Fly to the Sky a chance to debut. With the release, the group continued their successes with the album's title song, including two others, All Your Dreams and First Love. Only One was ultimately a stronger seller, selling 423,873 overall, and spending about 24 weeks on the Korean monthly Chart before it dropped.
In the music video, Only One, the members can be seen dancing in a warehouse or in a dark place. They also wore various clothings, from a black suit to wearing grey pants only. In the music video, All Your Dreams, in which Jun Jin stars as the main lead, the members of Shinhwa play various role. It also featured another SM Entertainment group, Black Beat as well as Kim Bomi. The music video tells the story of a man (Jun Jin) and a woman (Kim Bomi) who is giving off the image of being attracted to each other romantically. However, another man (play by a member from Black Beat) also show the same love interest in the woman as well, thus initiating a fight between Shinhwa and Black Beat towards the end of the music video. First Love, unlike the other two, did not show Shinhwa dancing in a choreographed dance nor portray a story. It features instead various clips of Shinhwa, from practicing their dancing to having their concerts. Wedding March, again starring Jun Jin as the main role, shows a man proposing to his love interest.