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The musical actress shared in an interview with Edaily Starin on the 13th, "Even when we were not close at the time, people around us would often say that we were very alike," explaining how she and her husband broke the ice and became friends.

As already reported, the couple met for the first time through the musical 'Three Musketeers', and quickly became close as they were similar in age and others told them about one another and how alike they were. They started dating in summer 2014 and not long after, Sungmin was said to have felt that Kim Sa Eun was the one. Kim Sa Eun also became attached to the Super Junior member as he was mature and was someone she could lean on. Even in the midst of his busy schedule, Sungmin would take care of Kim Sa Eun and try to meet up with her after their schedules were over. 

As their relationship seems to have progressed into marriage quite quickly, there were rumors of it being a shotgun marriage. However Kim Sa Eun once again denied that this was the case during her recent interview, and that they had decided on marriage fast because they both had been thinking about it as they dated one another.

As Sungmin will most likely be enlisting this year, Kim Sa Eun was asked what she was going to do while he was away for military service. She stated,"I plan on enrolling into graduate school, and plan to spend my time going to school and working as an actress." On plans for a baby, she said, "We plan to have one after Sungmin gets discharged from the military and promotes with Super Junior again."