I came across this drama as I was looking for more BL dramas to watch. So, my first point is EVEN THOUGH THE ORIGINAL WORK IS BL, THIS DRAMA IS ADAPTED TO A BROMANCE VERSION. Well, THEY ARE MORE LIKE SOUL-MATES BUT THEY GIVE OFF BROMANCE VIBES MOSTLY.
If you're into Chinese BLs, you know we always get platonic version of their love. In case of UNTAMED, I knew before watching that it's BL. So, while watching, even though it was platonic, I didn't get the "bromance" vibe because of the chemistry they had. Next I watched WORD OF HONOR. It too, did not give Bromance vibes. It was a BL with soul-mates / platonic lovers vibe. Same goes for KILLER AND HEALER. It did give Bromance vibes to certain extent but we could see they were platonic lovers. But this drama, GUARDIAN, GIVES THE BROMANCE VIBES. BECAUSE, THROUGHOUT MOST OF THE DRAMA, WE COULD SEE THAT IT WAS ONLY ONE OF THE MALE LEADS (SHEN WEI) WHO SECRETLY LOVED HIS CO-STAR (ZHAO YUNLAN) FOR MORE THAN 10,000 YEARS. ZHAO YUNLAN HAD NO IDEA OR MEMORIES ABOUT IT. SO, YUNLAN CONSIDERED HIM AS A BROTHER ( MORE THAN BROTHER TBH, BUT HE PORTRAYED A CHARECTERS WHO IS A CHEEKY, WORKAHOLIC, DOESN'T INVOLVE IN LOVE OR ROMANCE, SO EVEN THOUGH THEY DID LOVE EACH OTHER, THEY VIBE THEY GAVE WAS OF BROMANCE/ SOUL-MATES). BUT BUT BUT, OH WHAT A CHEMISTRY AND ACTING SKILLS THEY HAVE!!!!
THE LEVEL OF COMFORT, CONFIDANCE, UNDERSTANDING AND SENSE OF SACRIFICE THEY HAD FOR EACH OTHER WAS SO PLEASING TO WATCH.

COMING TO THE PLOT, In the first half of the series, it's like a fantasy murder mystery solving drama. (Like detective shows). In each episode, there's a new villian and Zhou Yunlan and his team (SID) fights against them. Shen Wei is always mysteriously involved with the cases. Though he helps out the SID team as Black Envoy, he gets into their suspicion as Professor Shen. IT WASN'T THAT INTRESTING BECAUSE EVEN AS A KID I HAVE SEEN MANY SUCH SHOWS OF SUPER HERO VS SUPER VILLIAN. I WAS WAITING FOR THE ACTUAL STORY OF SHEN WEI AND ZHOU YUNLAN TO START. It starts towards the later half of the series. Like I said, the drama has no romance elements between the leads but their chemistry, relationship development was still beautiful. Time and time again, we see Shen Wei's love filled glances and actions towards Zhou Yunlan. But Zhou Yunlan was always playful and more like "hey bro" (Just saying about the vibe he gave). Because even at the point when Shen said Zhou "I have been waiting for you for 10,000 years" in a serious tone, (much like a confession), Zhou just laughed it off, lightning the entire mood. But yes, both indeed loved , cared and respected each other.
I HATED THE ENDING THOUGH. IMAGINE HAVING TO WATCH 40 LONG EPISODES ONLY TO GET A SAD ENDING WITH BOTH MLs DEAD!!!!! SERIOUSLY, WHY DOES CHINESE BLs ALWAYS END IN A DISAPPOINTING WAY? THIS DRAMA AND KILLER AND HEALER HAD SUCH AN UNFAIR ENDING. ITS A FANTASY DRAMA, WHY COULDN'T THEY HAVE A HAPPY ENDING AND DIE JUST LIKE THAT? AFTER SO MUCH HARDWORK AND SACRIFICE, THEY DIDN'T DESERVE SUCH AN ENDING. THEY SHOULD HAVE ATLEAST REINCARNATED AND LIVED HAPPILY EVER AFTER AGAIN. :(
ANYWAYS, IT WASN'T SUCH A WASTE TO WATCH IT. I WASN'T SATISFIED WITH THE ENDING AND LACK OF BL, SO MOW M GONNA READ THE NOVEL VERSION OF THE STORY TO SATISFY MY HEART :)

Updated Review- NOVEL VERSION
OK so m done reading the translated version of the original work by Priest. Gosh!! I LOVEEEEDDDD IT SO MUCH!!!! TRUST ME IF YOU LIKED THE CHARECTERS IN THE DRAMA AND WISH IT WAS A BL, JUST GO AND READ THE NOVEL. THE STORY OF THE NOVEL IS MUCH MORE INTENSE AND INTRESTING AND VERY DIFFERENT TBH. PLUS THE ZHOU-SHEN COUPLE IS ONE OF THE BEST BL COUPLES I'VE EVER COME ACROSS. I WON'T GIVE SPOILERS, JUST READ THE NOVEL. YOU'LL GET A HAPPY ENDING AND YOU'LL FEEL SUPER SATISFIED. T