He was singing John Lennon’s “Imagine”. Click on tweet to watch:

[tweet https://twitter.com/twinkltwinkling/status/664739921345687552]

 

Regarding the video in which Changmin appeared in:

During the SM Entertainment x Korean Committee for UNICEF social contribution today, there was a video broadcasted. The video seems like it’s related to the ‘Schools For Asia’ campaign in which SM is involved in. The song was distributed amongst singers under SM, so that’s all of Changmin’s part.

 

 

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Credits:

Video by  @twinkltwinkling,
Changmin’s contribution summary by @twinkltwinkling and Translated by @tvxq_et_moi,
Shared by TVXQ! Express