On the night of the engagement party, Celia unexpectedly discovers her fiancé Andrew's affair with her half-sister katie, and learns that the two have long been plotting to harm her and seize her inheritance. In despair, she encounters Andrew's uncle Frank. To protect herself, Celia decides to use her body as bait, striking a deal with Frank. After a night of passion, Celia becomes Frank's secretary as planned—their public relationship is professional, but privately, they are friends with benefits.
Through repeated business collaborations and intimate encounters, Frank gradually realizes he is irresistibly drawn to Celia. Meanwhile, Andrew grows suspicious of their relationship, but his probes are repeatedly deflected by the pair. Just then, Frank's old acquaintance Jessica suddenly returns from abroad. Her abrupt appearance prompts Celia to distance herself from Frank, unexpectedly helping her recognize her true feelings for him. Her hot-and-cold attitude, however, leads Frank to misu
