The casting did a great job, although some of the supporting actors still need improvements though. The story is quite draggy, and I lost interest halfway through the drama, but I finished it because I love the actors and was interested to see the ending. Happy ending for villains is what I don't like about this drama, and the leads are too forgiving. There are no karma for bad character. Even FL's ex-fiancee who cheated on her, and pulling a fraud on her gets an okay ending, and FL ends up giving him money for him to settle. Furthermore, what I don't get about this drama is FL is too forgiving and trust other people easily, but treats her boyfriend badly even though ML gives all of him, which she doesn't deserve.
What I like about this show is only how mature the lines are. There are no acting cutesy or whatsoever, which I dislike. There is still room for improvements, FL dubbing is showing too clearly, I don't want to compare it to Korean Drama, but I have never seen any Korean Drama do any dubbing, or if so, they did a great job hiding it. But in this drama, the dubbing is too obvious, there are some scenes in which the dialogue doesn't match their mouths when they're speaking. The telephone ringtone is bugging me too for some reason, why can't they just use normal telephone ringing instead of a song, every character's phone uses the same song for the ringtone, and since this is a business drama, it's kind of expected that there are a lot of "calling" scenes, maybe 8-10+ per episode, so imagine listening to the same song for 40 x 10 = 400 times of the same song on this drama.

PS. I don't get why so many people are triggered by product placement (pp) in this drama. I didn't notice the pp at all, I think it's a normal amount of pp.