This is my first time watching a drama with either of these actors and only my second contemporary CDrama. I've been trying to figure out why I didn't like the drama much, because I feel like I should have liked it. the first 20 or so episodes were awesome (solid 9) but then it dropped to a 3 on the enjoyment scale and I found myself reaching for the fast forward button often. I ultimately concluded that the two lead actors were the problem.
Allow me to explain.
1. The ML did a phenomenal job with sad, longing, romantic, and/or flirty scenes. But for the technical scenes as an engineer in particular, or where he was supposed to be cool and aloof, he came across as not at all authentic. It's like he couldn't pull it off. There's a difference between aloof and flat. Likewise, there's a difference between stiff and intelligent. His aloof scenes came across as flat and his scenes where he was supposed to be demonstrating how brilliant he was just made him look stiff/robotic. This character was supposed to be passionate about systems engineering and the actor brought no passion to this part of his role (so, basically the basis of his central conflict and the core of his character).
2. The FL was really, really fun to watch, absolutely fantastic, until the two leads got together in the 22nd episode or so. After that point, she started randomly behaving in this really irritating infantile way that got worse with each episode. Her voice got higher and higher until she was using a baby-voice by episode 30. I was so sad because I really enjoyed her character up to this point.
Anyway. I'm willing to give these actors another try, but this drama was ultimately just average for me despite the story and direction being solid.