Fans swooned at the sight of two SM balladeers - EXO member Baekhyun and Super Junior member Yesung - singing a duet together.

EXO and Super Junior both took part in the SMTown Live World Tour In Japan concert in Tokyo.

On July 10, Yesung uploaded a photo which showed the two singers sharing the performance stage.

Baekhyun was wearing a crisp white shirt with rolled-up sleeves while Yesung wore a sleek black suit.

Both idols were seen crooning to the audience and then sharing a sweet smiley moment together after the song. Bubbles filled the stage, which made the collaboration that much more memorable for fans.

"Baekhyun + Yesung = ❤," "Why are you together OMG. Baek, stop seducing this cat," "Both of you so good together," commented fans on Instagram.

Baekhyun and Yesung are both designated balladeers in their respective boy groups, so their duet likely produced sweet music and melted hearts at the same time.

This led fans to coin the couple term of "BaekSung" for the singing duet.

Baekhyun, together with fellow EXO member Chanyeol, also showed support for Super Junior as the senior boy group is scheduled to make their comeback with the Devil special album on July 16. The album will commemorate the group's 10th anniversary since their debut.

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Mickey is a writer and digital content creator based in Manila. He is a co-founder of ZAVI App and editor of the small business blog IndieMickey. He has also been bitten by the K-pop fashion bug - follow him on Instagram @mickjami.