I started this drama because of Zhu Yi Long and because I found the promo photos picking my interest.
I must say though that I usually try to stay away from anything with Horror elements such as zombies or corpses and I'm not interested in movies and dramas about Tomb Raiding. Yes, this was the perfect drama choice for me. xD
After completing it I can say I don't regret my decision.

Even for a horror avoider like me Reunion is worth a watch. Simply because the main focus is on solving riddles and mysteries and the characters. I actually had fun trying to figure out clues myself, thinking of solutions for problems or predict what certain characters would do next. Not to mention that in the later episodes Wu Xie gets into a cat and mouse game.

A summarize of things I liked and didn't like:
+ Main Story is interesting and pace of storytelling good
+ Characters
+ Cast and Acting
+ OST (the soundtrack is great)
+ Teamwork/Friendship of main leads
+ Comedy

- A few side arcs where not that interesting for me (Piaopiao for example)
- we don't get to see the Iron Triangle together in the second half which is a bit disappointing
- some flashbacks seemed unnecessary to me and looked like they were included for a "little scare"
- Second half is not as interesting as first half, is even a bit boring at first but gets better
- flashback episode to Qi Jin does not benefit to the story in my opinion

The OST is really good and the tracks fit the story and characters excellently.

I'll be back for a rewatch. The drama missed the 10 rating by an inch but it's still a new favorite of mine.