The expectations of this drama were very high and among many audiences. Unfortunately it's not a drama for everyone. It's not a simple drama.
The editing is perhaps the biggest problem: there are too many time jumps and flashbacks to make it easy to understand.
At first you're drawn into the fake bromance between the two MLs.
Tae Oh seems cold and calculating, In Ha is nice but problematic and Hye Won look as though butter wouldn’t melt in one’s moutht.
Gradually we discover various aspects of Tae Oh, who turns out to be tender towards HW who reminds him of his childhood and his abused mother, naive and grateful for IH's friendship.
The development of the relationship between the president and TO is very beautiful: Tae Oh begins to be noticed as an instrument and insinuating into the president the idea of ​​better management of KangOh (he clearly indicates this in the first speech he writes at the presentation of the center). The president's attraction/need continues and develops to the detriment of the relationship with his three sons, who all suffer from an inferiority complex and are (rightly) afraid of the president's growing interest in TO.
They (chairman and TO) are among the few characters (with the Hacker, the Boss, Seong Ju and Hee Joo) who have positive development.
The main actors (and I'm sorry, but HW doesn't fall into this category, because she has only 5 minutes of footage per episode) are a spectacle!
Lee Jae Wook dressed in a business outfit with rolled up sleeves is a sight that alone is worth the effort of following the drama.
He is very good at managing his facial expressions: a complete change of direction compared to the Jang Uk of alchemy of Souls. The moment he lets some feelings shine through, it's easy to become attached to his character.
There are a lot of cuts where he holds the scene alone, with the support of his voice.
Jun Young is also very captivating, especially when he plays the positive parts, in my opinion he is too excessive in showing his psycho side.
The conclusion is fair and positive: Tae Oh wins, maintaining legality (unlike In Ha) and establishes an excellent relationship with Seong Ju.
The last scene with Hye Won suggests that the fleeting relationship is now over for both of them, while the relationship with Hee Joo is open: she can be a little sister or something more with the approval of the president and her brother!

I advise? Absolutely yes!