It's difficult to review this drama, because the story/writing is just abysmal, but despite that there are some amazing things in it too. Many comments talk about Hwang JungEum being terrible in this, personally I think that this is the role that fit her the most out of all the roles that she had, her acting was phenomenal, it's not her fault that she had to portray a superstitious nutjob idiot of a woman. Ryu Junyol himself is also a nice surprise, he was so much more interesting in this one than in R1988. (I never understood why everyone wanted him to be main character in 88) Their chemistry was amazing. I liked pretty much all the side characters too, the exception being Gary Choi. What a super annoying male second lead he was..

To elaborate more on the bad writing. After enjoying the first 5-6 episodes the drama really started to drag & the stupid triangle started to annoy me quite a bit and then finally when all that was resolved following just one fuzzy episode everything went to shit as usual in many kdramas. I mean good God, that fortune teller just had to ruin everything. The ending is a cliche fest, forced separation into time skip into a rushed reconciliation.

I could nitpick about inconsequential things too such as how Tennis players don't have agencies, but rather they employ a crew, or an agent if they have to. Tennis is not the SK entertainment industry. Then there is the blonde Novak Djokovic...
There is also the recurring theme of stealing games/code pre-release. There are very good reasons why this doesn't happen, especially how it went down the second time around. Then again these I could easily forgive..