I watched many c drama and still continue to watching but I only recommend both of these series because they are outstanding /Fabulous the whole story plot including the whole casting every character make your attention each and every scene create curiosity what will next happen there is no comparison between the two of them but when I think about the outstanding series just two name come in my mind

Similarities

1)Outstanding Chemistry between the main lead including face expression its very tough to impress by face expression

2) Investigation and link between the cases

3) The two main lead not like each other but best friend in the end who sacrifice their own life for other

4)Create miss understanding between each other to protect his partner from evil

5) Royal Image many people follow him (in Untamed Lan Zhan has a personality and in under the power Lu Yi has that image)

6) Story of main lead background impact on his present life

I still finding another series like both of above
There are many but the standard are not high like The Untamed and Under The Power