Smile has left you eyes. First of all not a big fan of Seo in Guk, especially when he's acting all cocky. Also, didn't like the fact that they are using the Second female lead for their advantage and the old cliche way of Female lead loving a jerk and turning him into good person/understanding him kind of plot.
Whenever I See that kind of plot, reminds me of those idiotic people who stays in abused relationship or those people who goes behind messed up f*ckboys whom they know are messed up, but thinks that they could change them and all those bullsh*t.