Bo-ra, aka dating coach Deborah, believes that a strategy is necessary in a relationship. In order to lead the relationship with her boyfriend Ju-wan to a happy ending, Bo-ra strategically plans to get a proposal from him. However, her plan is ruined by Su-hyeok who is also determined to propose to his girlfriend, Yu-ri.

Deborah, it is all your fault! Su-hyeok blames Deborah for his breakup with Yu-ri, and they go head-to-head at their first work meeting together. But the tension between them has unexpected outcomes...

Bo-ra still denies Ju-wan is cheating on her, even after she witnesses it herself. She rationalizes his behavior and hopes he will sort out the situation. But things don't go as planned. Bo-ra overhears the truth Ju-wan has been hiding and it all leads to a devastating consequence.

Before overcoming her breakup, Bo-ra hides her pain behind a smile and attends a major party for singles. At an important moment, drunk Bo-ra is invited to the stage, and with the microphone in her hands, she goes crazy. Knowing the pain behind her smile, the one person ready to jump on stage to save her is Su-hyeok.

Bo-ra finally decides to gather herself, being free from Ju-wan for good. While sharing the good news, Bo-ra also says goodbye to Su-hyeok. Just when Su-hyeok thought he won't see her again, Bo-ra reaches out to him once again.

After Bo-ra finalizes her dating book contract, she joins the dinner with the staff of the publishing company. Just when Su-hyeok thought he has seen all the embarrassing moments he can of Bo-ra... She strikes again.

Su-hyeok is invited to Bo-ra’s housewarming party. As the two of them start a plan to win back Ju-wan’s heart, they get closer. And a sudden silence leads them into an unexpected happening.

After the unexpected kiss, both Bo-ra and Su-hyeok are confused. They agree it was a simple mistake and decide to forget about it. Yet, a little disappointed Bo-ra makes a mistake again and Su-hyeok is determined to not let her off this time. Before they clear the air, they run into each other in an unexpected place.

Women's Secret Party turns into a crazy couples’ party. Bo-ra and Su-hyeok reconcile their relationship by defining each other as Mulder/Scully and DiCaprio/Kate Winslet. At night, Bo-ra receives a surprising message. If a catfish makes way, is the sardine going to make a move?

The presence of the tough catfish Yu-ri shakes Su-hyeok. Bo-ra tries to stop Su-hyeok when he is about to leave for Yu-ri. Bo-ra criticizes Yu-ri for being clingy but soon realizes she does not have the right to do so. And finally, Bo-ra decides to face her disguised relationship with Ju-wan.

Bo-ra and Su-hyeok walk a very thin line on their exciting first date, and Bo-ra is more confused about her relationship with him. Bo-ra accompanies Su-hyeok to Yu-ri’s wedding as his girlfriend, and she recalls a memory during the ceremony. The memory makes Bo-ra anticipate that something like a scene from a drama could happen to her as well.

With Su-hyeok’s support, Bo-ra returns to the radio. She expresses her feelings towards Su-hyeok on the radio, and Su-hyeok runs to Bo-ra to show her how he feels about her too. But Su-hyeok sees Ju-wan arrive before him and the bad timing makes them misunderstand each other.

Dating someone at work is the worst. Bo-ra and Su-hyeok explode with anger during a meeting, and the publishing of Bo-ra's dating book ends up in failure. At night, Bo-ra storms out when Su-hyeok calls her as she realizes it is time to write the ending of their story once and for all.