Definitely enjoyed it more than I expected (due to the low rating of people here)

Reason 1:
I FELL IN LOVE WITH GO YOON JUNG
Many people seemed to be rating this low because of the change of female lead but come on now. Gyj was literally the female lead right from the start. Plus she's a great actress so I don't understand the hate.
She's so adorable and she portrayed Naksu well. Even though she has different aura due to memory loss, you'll still see Naksu.

Reason 2:
I'm a sucker for romance like this.
The tsun husband x cute wife is just *chef's kiss* Many might find Jang Uk weird for falling for Jby(Naksu) in s2 but I don't think you should think it deeply that much. If he fell for her before, why can't he fell in love with her again? His hearts remember her. That's why at first he's confused on why he feels something for her. But again, his heart recognize her. And dude, I know you expect him not to move on that fast but HELLO it's already been 3 years that time. Even if jby was not Naksu, he deserve to fall in love again. Plus jby was really loveable (AND SUPER PATIENT)

Reason 3:
The chemistry of the characters are on another level!
I personally love turtle couple(Crown Prince x Jin Bu Yeon) Their exchange is always hilarious. Totally love their every scene!

Reason 4:
Great Effects. Some found it lacking but personally, it was amazing. Everything was so original and creative.

Reason 5:
Overall Plot. It was different from S1 but I was not disappointed. I never thought I would love it this much tho(enough to make me write a review.) I saw some wasted potential in the plot but it was still enjoyable despite that

So what stopped me from rating this a perfect 10?
1. Too short! I want more of their fluff scenes.
Many hated that s2 story was centered around their romance but I LOVE IT SO MUCH. We didn't get much romance from the s1 so this os like a treat to me(Who like romance more than Action)

2. We didn't get to see the return of Assassin Naksu.
I'm kinda fine with it but it's just a let down cuz gyj looked badass on s1e1. Assassin Naksu Supremacy!

3. So-i was not given the happy ending she deserved.
I know she's bad/evil but SEO-YUL HAS NO END GAME SO WHY NOT JUST LET HER LIVE AND MAKE THEM LIVE HAPPILY EVER AFTER?! I was disappointed when she died when we could have just get a character development.

Overall a totally good series! I'm already at my third rewatch cuz I can't get over with Jang uk's and Naksu's sweet scenes. Totally recommended, if you're a sucker for romance drama with a good plot and some action.