Justin Timberlake Searches for Mystery Couple

The pop star is using his new music video to search for a couple that got engaged on a train.
3:00 | 03/21/14

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Transcript for Justin Timberlake Searches for Mystery Couple
A little Justin Timberlake right there. "Not a bad thing." His new music video at the center of a search of a romantic couple who decided to get married on a train. Some documentary filmmakers and have some skeptics wondering if it's all just one big marketing ploy. ABC's Mara schiavocampo takes a look. ? To see you tomorrow ? Reporter: He's a man on a mission, Justin Timberlake using his new music video for "Not a bad thing" to find two mystery lovebirds who got engaged on the train this past January. The romantic proposal reenacted in the video, you can see the man blasting "Not a bad thing" out of a boombox much like the iconic scene in "Say anything" ? I reach out from the inside ? Reporter: It turns out the video is the brainchild of two documentary filmmakers who say they heard about the proposal on the Long Island railroad and are now on a mission to track down the railroad romantic. We don't know who these people are or what their story is. But maybe you do. We're making a documentary about finding love. Have you seen this couple? Reporter: The filmmakers say they've gone full speed ahead in their mission putting up flyers and reaching out on Twitter but they say Timberlake's use of the documentary for his video is the best exposure yet. It's a great story and it's more finding the romance of that. We do have the facts and know they're on the babylon line so we're looking for all those towns along the babylon line. Reporter: But the video raised suspicions. While several say they witnessed the proposal many are wondering if it was staged from the start as part of an elaborate marketing ploy for the song. His marketing reps had no comment. More and more musicians don't feel the need to do the traditional marketing. I'm sure it's not 100% true. Reporter: After all, everyone is a fool for love. For "Good morning America," Mara schiavocampo, ABC news, new

This transcript has been automatically generated and may not be 100% accurate.

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