Don't know if it is true:
Official Music Video and Song for Allied China Release.
Lyrics and Melody: James Alan, Peter Svensson, Johan Carlson
Produced: Max Martin, 赵兆
Director: 彭宥纶
https://www.youtube.com/watch?v=znHX5Lyh7lM
Cheesy AF.
His vocals are almost untouched besides some harmonies, with only strings and piano. Max ballads have way more work into it than this, and I can't confirm these credits anywhere else. I believe this isn't Max at all.