First of all, I have rewatched this drama for about 3 or 4 times. So, they rewatch value is explanable :D

I dont know why I enjoy watching this drama despite the various negative reviews I read from many different sources. People told me that the story is boring and the progress is too slow. However, I gave it a shot and watch this drama. At first, it is because I like UEE and Sung Joon is undoubtedly an eye candy >.<
As I progress through the drama, I found myself liking it even more. I love the story and how the problems developed and finally solved. Although tbh, I skipped all of the elderly parts when I rewatch this drama, it does not mean I like this drama any less; I really love this drama.
Maybe I am weird, but I think the problem brought up in this drama is unique. Never did they come across a drama where a guy deceived the girl to this extreme. Nevertheless, I did not hate Sung Joon. In fact, I love how he gradually realizes his feelings.

My love for this drama also emerges because of the casts. They are all so good. All of them really demonstrate what is it like to be someone who is in love, heartbroken, desperate and hopeless. I smiled and cried with all of them. While most of the people who watch this drama like the second couple more than the main couple, I personally prefer the lead couple - maybe because of a personal reason. I am a logical person who is skeptical about love, looking at the main couple, it makes me think that maybe love does exist. I also love how both of them grow with love. UEE grows into someone stronger while Sung Joon grows into someone more humane. Maybe I am weird, but I enjoy the heartbreaks - especially when UEE found out about everything. I have one question tho, how can Sung Joon's stare be so deep and gloomy? I really admire his gaze; so heart-flattering <3
For the second couple, I love how they overcome their problems too. I love Ji Yeon's positive and cheerful attitude; really wish I could be that cheerful. I also love how Hyung Sik changes as he fell in love. Unlike the typical chaebol who USUALLY give up on his love, Hyung Sik fight for his love. Proud of him!

Moreover, the songs are also very suitable for different scenes. I usually do not give much attention to the songs played during various scenes. However, since the songs in this drama are very impactful, I can't help but notice how suitable they are for the scenes. Great job!

I recommend this drama for those who are looking for something meaningful. However, you guys should be prepared for some draggy business and elderly related matters tho :D My suggestion, when you watch it for the first time, watch everything. When you rewatch it, just skip those parts as you aready has a grasp of what is going on - this is what I usually do hehe.. I only rewatch this drama to re-feel the heartbreaks I felt when watching this drama; kinda weird but this is my reason :D