Body Swap: Wait, I'm a Rich Little Lady?

After finally landing a job, Yun Qingyu discovers that the assignment is to find the eldest daughter of the Yun family. But hasn’t she seen this young lady somewhere before? After finally tracking her down, she learns the girl already knows her and has been waiting for her all along. What happened in their forgotten past?

“What? I’m the young lady? Then who are you?”

“I’m you.”

“?!”