Seohyun returned to Seoul after her schedule in North-Korea with a shock of her life, after learning her cough is not a simple sickness - that she developed double pneumonia and needs to be treated right away.

Now, her parents are suggesting to bring her to the United States to have her treatment as soon as possible. However, she can't leave without telling her friends and her lover about her leave.

The problem is, Yoona is in Dubai and will comeback in three days.

Will she able to tell her about her leave? Or will she just keep it for herself?