Changmin had said in the bts of Begin Again MV to Toho band that he gifted himself a guitar, so this is probably it~ ^^

https://www.instagram.com/p/Bgz4mdPAOL7

Translation:

The guitar Changmin is using as a beginner’s guitar was stated by a guitarist to be a guitar of which there aren’t many in Kr; not only that it is about tens of millions of won (1mil won is about USD$1,000)..and he’s using it as a beginner’s guitarㅋ said he was a “young chaebol”

Also,  related to his guitar, the gold and silver guitar picks made for Changmin back in February, 2014 spotted by the pick-maker in I Live Alone

[cr: @YH_CM_1226_ via @snxy]

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Credits:

Lim Seong Hee (hee__lim): here,
Translated by @snxy,
Shared by TVXQ! Express