What happens when you marry a man who degraded you seven years ago...... 

What happen when you fall in love with your own old enemy?

What will happen to this hate - love story???

Will there be an happy ending for the two of them??

Will there be a third person in their love story??

The story about a regular doctor, Song Yoo Rin who marry a top-star from B2ST, Yong Jun Hyung... Both of them hate each other since high school..

But Yoo Rin is the only one who is still hating Jun Hyung while Jun Hyung already slowly falling for her charms when Jun Hyung was announced as the president and Yoo Rin as the vice-president. Until then, they always arguing even about the small things.

After 7 years, they meet again and was arranged to marry by their family for the sake of their fathers' friendship knot. But then, more conflict started to happen as Hyun Seung from the same group as Jun Hyung had already fallen for Yoo Rin since before Jun Hyung knew Yoo Rin. Jun Hyung's ex-girlfriend are also complotting to make Jun Hyung hers.

How will this love story will go with all the conflicts and scandals??

Down To The Grass..........