JJ Lin's "JJ20 FINAL LAP" world tour filled the Seoul venue for two consecutive nights with fans. While the first night featured guest Kim Jong-kook, the second night welcomed China-born member Song Yuqi from the popular girl group (G)I-DLE.

As soon as Song Yuqi appeared, she joined JJ in singing the classic love song "背对背拥抱" (Back to Back Embrace), blending gentle and powerful vocals that instantly elevated the atmosphere. Following that, she performed her solo song "FREAK," where JJ not only joined her in dance but also challenged himself with girl group style moves, sending the crowd into a frenzy.

What moved the audience was that earlier in 2023, Song Yuqi had publicly stated that "Back to Back Embrace" was her favorite Chinese song and had even sung a portion of it on a variety show, which went viral online. Now, she was able to perform alongside her idol JJ, with fans declaring it a "perfect example of successful idol-chasing" and expressing how touching the moment was.

After the show, keywords like "JJ Lin and Song Yuqi duet" instantly trended on social media, and the views of their collaborative performance quickly surpassed millions, with fans hoping for another collaboration and the discussion heatedly continuing.