one of the keys of success of this drama is Lee dae hee , a complicated caracter that she made look easy make in it funny romantic and sad from time to time. the 2° key is the high chemestry between the leads(3 of them), it s drama that could really celly and normal but i think its really well done, you laugh you cry and you discover seoul at night :D one of the most outstanding OST ever nice songs which made the drama even better!!!!! to sum up great drama a classic for me that you can watch and rewatch without getting bored!