Original song by italian group Il Volo.
During Phantom Singer's 1 VS 1 battle, it was performed by the tenors (and best friends) Paek Intae and Yoo Seulgi.
The winner was Intae, who could advance immediately to the next round. Seulgi became a candidate for elimination, however, this performance was considered the best one from the round, so he was able to advance to the next one with his friend.
English and italian are not my native languages, so if you think some parts of the translation can be better, don't be afraid to leave a comment ^^