I was a bit skeptical watching this drama because I've only seen one drama of both of the ML & FL. So I wasn't sure about how the acting will be here.
I enjoyed it. It was a nice break for me because I've been seeing a lot of dramas with the same events repeating for a couple (such as breakups, misunderstandings, damsel in distress situations, parents causing problems in relationships, jealous exes trying to sabotage the relationship, etc.)

I like how this drama tried to be as realistic as possible. We have a smart ML but he has some flaws as well. They may not be the best flaws (but it's still different than Yang Yang's flawless character with no struggles in Love O2O by the same writer). They spent a decent amount of time to show his struggles and how hard it was for him to make important decisions for his life. I think that was enough to show that he's not entirely perfect. They also tried to throw in some scenes to show that he's not the only smartest character in there. They obviously didn't focus on the other smart characters because they're not the main focus of the story so I think it's understandable.

I also like how the FL's character is written. She's endearing, has a high EQ, and most importantly not obnoxious for the age depicted. I cannot watch FL characters who are shown to be in their late 20's or early 30's and they act like someone who just turned 12. Jing Jing may be playful, but she's not one of those typical childish/dumb FL. (Those childish FL's who have a crush on the ML and start to cling on them right from the start in such a cringe way. Or they use childish tricks to try to make the ML fall for them. Oh, and those FL's who fall for the man immediately when he leans against her while teaching her or they had some sort of physical contact.) Jing Jing somewhat pursues him by making him her coach but she wasn't all over him and following him everywhere.

Now for the romance. It does take awhile for our couple to get together. (I think halfway through the drama they're finally together). So for some the development of the romance will be slow. I think the pace was fine. Our leads were high school classmates, but they didn't have much interaction then. It was necessary for them to get to know one another in the beginning of this drama. Then you can see them slowly fall for each other. The main problem they faced was before their relationship started, so I'm glad about that. They were very understanding of each other. I like how both of them respected each other and they supported each other. They were also both able to pursue their dreams and have a successful career. Their chemistry was amazing! Once they got together, there were some moments where you couldn't stop smiling or getting embarrassed from watching them.

This drama mainly focused on our main leads. There wasn't much story added to secondary characters which I found okay. They didn't need a secondary couple to drive the story forward, the main couple was perfect enough. However, I just found it a tiny bit annoying, that they added some characters in there and they just suddenly disappeared or became irrelevant (like Yu Tu's friends that he played the game with.)

I'd rewatch it but I'd probably skip some parts.
Also, some people might be deterred because there is a lot of aerospace terminology and won't understand what's going on in the scientific aspect. I probably wouldn't focus too much on understanding those scenes and let it hinder the overall watching experience. There is also some gaming in the start of the show, but it's not something you have to understand much either. The gaming aspect isn't the main focus of the show.