Jay Chou and JJ Lin surprised fans by performing a duet of Jay Chou’s latest song, "It Rained That Day."

The collaboration first hinted at on June 9, when Jay Chou posted a photo with JJ Lin on Instagram, teasing that JJ Lin would cover one of his new songs. Jay Chou invited fans to guess, writing, "Which of my new songs would everyone like to hear JJ Lin cover? Stay tuned tomorrow at noon!" [1, 2]

The next day, JJ Lin confirmed the duet by posting a video of them singing the song together. He captioned the video, "Lovin’ the duet vibes – jamming with the GOAT," celebrating the moment with the veteran singer-songwriter. [1, 2]

Fans had already caught wind of the collaboration after JJ Lin was spotted humming a snippet of "It Rained That Day" during a livestream, which fueled early speculation about a joint performance. [1, 2]

The photo Jay Chou shared may have been taken during filming for his travel show "J-Style Trip," reflecting their friendship and history of collaborations, though this detail is unconfirmed. [1, 2]

Fans reacted enthusiastically online, praising the vocal chemistry and asking when the two would collaborate again. One fan joked, "When are you two releasing a song together? I’ve waited so long my hair has turned white." Another called for a joint concert, saying, "Give us a JJJay concert!" [1, 2]

There was initial uncertainty about the video’s authenticity, as fans quickly checked to ensure it wasn’t made by celebrity lookalikes, a trick seen before online. One fan admitted they "spent five seconds checking if they were the real ones." [1, 2]

Amid the buzz, slight disagreement exists around Jay Chou’s age: one source states he is 47, another says 46. [1, 2]

The duet video posted June 10 remains the most recent update on their collaboration, keeping fans eager for potential future projects between the two stars. [1, 2]