I hated the character of Ma Hye Ri, badly written, she made no sense whatsoever and I was very disappointed in the actress (Kim So Yeon) portrayal of the lead role.
Yes I agree with the comments about the sizzling chemistry between the main leads. This is one of my favourite dramas. I loved it ! The only thing that spoiled it for me was Hyun Soos mom she annoyed me so much
Out of the new dramas I recommend Advertising Genius Lee Tae Baek & That Winter, The Wind Blows