In this world plainly defined with the essence of a bloody competition where only the fittest continues to stand, lives Sandara Park, who is a very competent student that has a morale that never settles for just surviving but is aiming to take hold of the top-most position, but despite the efforts that she had already exerted, everything suddenly went out of her grasp and was replaced by an all annoying and very hard to comprehend transfer student. For such incident, Dara was forced to take an offensive measure that would eventually cause her to be indulged in mystery cases. Different cases arise to be unveiled, secrets will then be uncovered, and… will romance actually unfold?