BTOB's Sungjae put his all into a cover of Junsu's "Yesterday".

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The adorable BTOB member went into serious mode as he stepped into the studio for the song. It's obvious that he makes sure to give the ballad everything he has, and his soulful, tender voice is perfect for the sad love song. JYJ's Junsu would definitely approve.

Check out Sungjae's cover above, the original below, and let us know what you think!