I would say this drama has one of the great starting that any drama can had, yep it start with a blast and I thought it has potential to become this years best drama, great starting, good backstory, amazing cast it had all potential to be the best but it lost the track.

Cons -
1. They made a very strong second main lead much better than main lead and the first episode was full of the backstory of HJK so it kind of gave hopes to the HJP fans that there is still chance for him.
2. No character development I mean there was nothing new aspect in characters they have same personality from starting to end.
3. This drama should be based on start up but it ended up dragging love triangle all the way that's the thing made this drama a disappointment. I am not upset because of who got the girl thing I am upset because if female lead gonna end up with male lead then what is reason of making 2nd lead perfect?
4. The male lead. One the main reason of failure of this drama I know many of NDS fan's que is what did NDS did wrong but thing is he did nothing, really nothing it was one of the poor written character of the drama without any character development.
5. The female lead. In the first few episodes I thought SDM had potential to be one the strongest and clever female lead, but it became kind of miserable you know they use the concept ( typical ) knight saving beauty.
6. The lovestory between main leads wasn't that interesting.

Pros -
1. Beautiful cinematography I must say the cinematography was great with beautiful camera anglrs.
2. The strong backstory.
3. The relation between HJP or I say Good boy and Grandmother was potraited beautifully it was the thing I liked most in the drama.
4. Ost and soundtrack was amazing I must say.

Overall it was an average drama if you are big fan of main leads or you have a lot of time free then you should watch it. It wasn't all waste of time but it's also not worth of time,