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...

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.

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.