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| | Kang Ji-Hwan as Lee Jin Soo - At first sight, Lee Jin Soo is nice, charming and humorous, but under that false pretense he is actually mean, weird and sarcastic. He has odd habits and likes to make fun of others in order to entertain himself. He is close with Eun Young, finds Seung Yeon amusing and tries to avoid Ji Won. |
| | Park Si-Yeon as Seo Eun Young - Seo Eun Young is an independent woman who hates weak damsel-in-distress type of females as she believes in her own strength. Although she knows Jin Soo from the past, she still finds him hard to understand. Though constantly at war with Jin Soo over work she joins forces with him to make Ji Won give her up. |
| | Ham Eun-Jung as Kang Seung Yeon - Kang Seung Yeon has always been below average in everything. By pure coincidence, she becomes a secretary for the famous writer Jin Soo who turns out to be a complete psycho. She is very honest, naive and somewhat clueless, but helps Jin Soo every step of the way though he mostly takes joy in torturing her. |
| | Jung Woong-In as Han Ji Won - Han Ji Won is known for his cheesy manners and obtuse thinking. Hoping to reunite with Eun Young, he returns to Seoul, clueless that his presence is unwanted. Brimming with unwarranted confidence, he tries to get Eun Young back, using all kinds of cheesy events and dragging Jin Soo along on his artless misadventures.
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