This love action is a masterpiece and that is not an understatement. It has stayed true to the book (aside from leaving out a few details considering the book is BL while the show is bromance), however, it did not deviate and provided just enough detail that even us (who have read the book first) are familiar with.
Unlike the book, the live-action went into a flashback scene towards the end of episode 2 to showcase what happened 16 years ago before Wei Ying's death and returned to the 'present' time 16 years later around the 32nd episode. - I've seen a few comments where people have disliked that arrangement since "it wasn't done in the book". The live action's sole target audience isn't just for those who have read the book but THOSE WHO HAVE NOT which is why the flashback was necessary. If you push away the book entirely, and simply view the drama as it's own stand-alone, you will realise that they have done justice to the story with this live-action.

The acting was superb; from the dialogue, the emotions and even to the stares Lan Zhan and Wei Ying share, and their character development.
The way the drama was laid out, makes it easier for the audience to understand the story and obtain all the information, without getting confused or lost as it progressed. I was also impressed with how Lan Zhan and Wei Ying didn't overpower the side characters. Although they are the main characters, there was still plenty of room for the other characters to shine and thus, allowed the drama to come together as a whole without any gaps.

The soundtrack that accompanied the scenes (on multiple occasions) amplified the impact of the acting. dialogue and emotions. The emotions invoked in the audience was brought up by the influence of the soundtrack that amplified scenes. Although the acting was superb, without the soundtrack, the scenes would feel extremely lack-lustre and would not be able to invoke large enough emotions from the audience