Many weeks ago, fans first noted the bandage on the back of Sungmin, where the tattoo would later appear. This could help him change his image from his current cute/innocent feel to a more manly/strong aura as he gets older.
Do you like this look? Or does the tattoo not suit him?
Credits to allkpop.com
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I think it's a good change. That way, more people will see him as more than just a cute face. They'll see him as a MAN with a hot tattoo.