In West Kingdom, she is Princess Jung Sooyeon, in Califronia, she is Jung Jessica. 

She was recently dumped by her ex because he was enegaed to Princess Sooyeon, which he didn't know was Jung Jessica in disguise. 

In East Kingdom, he is Ok Taecyeon, in Califoria, he is Lee Donghae.

He recently dumped his ex, because he was engaged to a force marriage with Princess Sooyeon, little did he know that Jessica and Sooyeon are the same person.