The selling point of this drama was the off the charts chemistry between On Jung Sun and Lee Hyun Soo.  There were a number of charming parts to this drama.  On Jung Sun was the first beta boy that completely swept me off my feet.  Yang Se Jong did such an amazing job in this role.  Also I really enjoyed how Seo Hyun Jin was able to portray such an independent and likable female lead in Lee Hyun Soo.  
Where this drama missed the mark was in all the obstacles it threw at this precious lead couple. This just led to a lot of unnecessary mellodrama.   There are issues with their friends, family, money and on and on.  This setup got sooooo repetitive.  I wish this drama had a way of focusing more on the couple.  Overall, a sweet drama but your pretty standard fare.