Can anyone please suggest drama as same as THE UNTAMED!!!! 

It's amazing eeh? I totally agree haha hm...sadly i havent seen anything like it. I guess the closest a drama has gotten (that i know of) is Warrior baek dong soo. The bromance is so cute however Wareior baek dong soo is a korean drama and it is not based on any BL novel. But do check it out :)

Not a historical drama, but if you want bromance, try Guardian starring Zhu Yi Long and Bai Yu.