Gain and Jo Kwon are teaming up again for the first time in 16 years, reuniting as a duet that brings back memories of their iconic pairing.

On December 17 at 6 p.m. KST, the two artists will release the movie OST collaboration track "We Fell in Love (2025)" across major music platforms. The song is featured in the film Even If This Love Disappears from the World Tonight, adding emotional depth to the story.

"We Fell in Love" was originally released in 2009 during We Got Married Season 2, where Gain and Jo Kwon captured massive attention with their natural chemistry as the so-called "Adam Couple." The track became widely loved for its sweet mood and heartfelt delivery.

The 2025 version reinterprets the song with more mature emotions and a richer vocal blend. Their harmonies are expected to heighten the winter mood and resonate deeply with listeners.

A representative shared that the relatable lyrics convey fluttering emotions and invited audiences to look forward to a more convincing and immersive storytelling experience.

Even If This Love Disappears from the World Tonight tells a tender love story between a high school girl with amnesia and an ordinary boy. The film stars Choo Young Woo and Cynthia and is set to premiere on December 24.