Recommendations

In both of these period dramas the leads travel around their country, and as they are traveling they are taught by different martial art legends. The main difference is the main lead in The Legend of the Condor Heroes is a man, and the main lead in the Legend of Fei is a woman.

If you liked The Great Shaman Ga Doo Shim
...then you might like
There are many similarities
ML is shaman too

Both dramas involve the FL living another person's life (in Mask while being a doppelganger and in 49 Days by possessing a body). I feel like the melodrama aspects of them are somewhat similar as well.

THE BROMANCE!!! While Untamed is originally a BL and Devil Judge is a bromance gosh you have to watch them both!!! Th tension is so freaking thick and the chemistry is sizzling!!!

The bromance in both is killng me wow so gooood
The way they work together reminded me of the other drama!
Definitely have to check them both!!!

The bromance in both is just so freaking satisfying!!!
I love the way in both the dramas the MLs know what each other is thinking without words and the tension is just GOSH THICK!!!
If you liked this definitely have to watch the other!! Trust me, you'll love it!!!

- historic setting
- both main leads are super smart, has their own backstory
- interesting plot lines and mysteries that just makes the audience want to know more
- developed side characters (both dramas have really cool side leads that makes you fall in love with them)

DIFFERENCES:
- Miss S is female lead-based; smart & strong, no-nonsense personality but also hilarious

- Ancient Detective has a more serious atmosphere with a bit of humor in it

Totally reccomend! Miss S has a lighter atmosphere compare to Ancient Detective but both are really good in their own ways.

- ML with loss in memory.
- FL is a capable secretary.
- FL babysits 2nd ML and his BFF.
- Past connection.

Gameboys the Movie and Pearl Next Door are parts of the same universe. Both series and movie feature Adrianna So.

Gameboys the Movie is the sequel of Gameboys The Series Season 1. Both series and movie feature Elijah Canlas and Kokoy de Santos.

Gameboys the Movie is the sequel of Gameboys The Series Season 1. Alt.Gameboys is Season 1's Episode 13.5. All the characters from Alt.Gameboys are featured on Gameboys the Movie.

Gameboys the Movie is the sequel of Gameboys The Series Season 1. Both series and movie feature Elijah Canlas and Kokoy de Santos.

Both dramas are based on the same history surrounding Hong Taiji and Da Yu'er. The characters in The Promise of Chang'an are counterparts of historical figures in Qing Dynasty during the respectful time period:
He Lan Mingyu - Da Yu'er
Xiao Chengxu - Dorgon
Xiao Chengru - Hong Taiji
He Lan Wanyin - Ha Lan Zhu
The only significant difference is the Promise of Chang'an is set in a fictitious dynasty rather than the Qing Dynasty due to censorship.
It's also ironic that Han Dong (who played Dorgon in 'In love with Power') plays Xiao Chengrui, Hong Taiji's counterpart.

high school time.,sweet school love
pure hearts, frindship faith, hope,desapointment
family love, child duty and work , how to fight with our past and how enjoy the youth

totally different story/genre/feel, but I recommend because both have same rare situation in romance part.
(spoiler):
If you liked story line where FL loves man even knowing he is gay, and that man also loves her, is friend and support for her, cares for her, but of course different way, he romantically loved other man, but now tries to be man/husband for her; also there is another man who loves FL... then you should try second drama too.

SB is more drama, intense plot, revenge and serious vibe, Hyena in more light and more romance focused