Implicit version: Su Yi didn't expect Ye Gu's feelings to be so pure. He started with deception, but was finally moved by his purity and sincerity.
When she finally takes action, he disappears. When they met again, it turned out that everything was just a disguise. He was not the same person before, and she was not the same person as before.
We have not been real, we have been sincere.
Straightforward version: The female protagonist is an agent, hired by three parties at the same time, and approaches the male protagonist with a purpose, but is moved by the pure emotion of the male protagonist.
The male protagonist is very sinister. He pretends to be a pig and eats the tiger. He suspects that the female protagonist's identity is not simple from the beginning. After getting closer, he confirms it and pretends to be innocent. The two of them pretended to deceive each other, but in the end they could not deceive their own hearts.