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In the new poster, Yoon Sang Hyun and Lee Yo Won can been seen dressed in completely opposite blue and red, representing the yin and yang personalities of the two lead characters.

Yoon Sang Hyun will be playing the role of Nam Jung Gi, the most indecisive, reserved, type A personality guy around. On the opposing end, Lee Yo Won will be playing the role of Ok Da Jung, a loud, outspoken, blunt 'unnie' predicted to cause Nam Jung Gi some serious conflict.�

Catch 'Ms. Temper and Nam Jung Gi', when it begins airing on March 18!