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According to this exclusive report, an insider who is allegedly acquainted with both stars tipped off, "Minhyuk and Jung Hye Sung, who are the same age, have been in a serious relationship for quite some time. Though they're careful about their relationship, everyone around them and their family members are aware [that they are dating]." 

The insider further stated that Minhyuk is quite the romantic type who would visit Jung Hye Sung's home with gifts, saying, "Minhyuk is exceptionally diligent and is widely know to possess a good character. The same could be said for Jung Hye Sung. They share the commonality of being celebrities, and because they are the same age, they tend to understand each other. They both raise cats and they also both enjoy flower arrangement as a hobby. They are a couple that anyone can relate to on many levels and would be envious of." 

If what this insider says is true, then best wishes to the couple! May they share a long and happy relationship!