On March 4, the idol contestants of the Watcha-original music variety series 'Double Trouble' took to the stage to compete in their final battle round. 

Each week on 'Double Trouble' K-Pop musicians including 2AM's Seulong, Jang Hyun Seung, Block B's Taeil, SF9's Inseong, WEi's Kim Dong Han, Minzy, Hyolyn, ChoA, KARD's Jiwoo, and Weeekly's Monday chose a different duet partner to put on unique collaboration stages. 

For this week's final competition round, the contestants were tasked with the mission of choosing a song which reflected the theme of "History of K-Pop". 

Check out all of the performances from this week's 'Double Trouble', above and below!

First, SF9's Inseong and KARD's Jiwoo transformed into the baddest couple of all, The Joker and Harley Quinn, for their own, unique rendition of Stray Kids's "Back Door" (video above). 

Next, 2AM's Seulong and Weeekly's Monday enlisted the aid of a grand orchestra for a duet to 2PM's "Again & Again". 

Jang Hyun Seung and ChoA tested out their chemistry to miss A's "Hush".

Hyolyn and Kim Dong Han took viewers back with Sechskies's "PomSaengPomSa". 

Finally, Block B's Taeil and Minzy treated viewers to a fairy tale stage with GFriend's "Me Gustas Tu". 

Meanwhile, viewer voting for the final round of 'Double Trouble' will take place until March 11 at 10 PM KST.