I appreciate drama's like this so much. More complex and true to real life and with lots of nuances. Infidelity is something that many people have a very harsh, black and white view of. So I loved how this drama delved deep into the complexities of a longterm monogamous relationship, how two people can live together yet not really SEE and FEEL each other, how intentions going into a relationship easily get forgotten in everyday life, how a stress can impact even a good relationship very negatively... Lee Sunkyun is carrying this drama so well. There is such an honesty to his performance. And with an enjoyable cast this really made for a great viewing experience. I also loved that they kept it to 12 solid episodes and didn't drag it out to 16.