Ever Night

Both have OP male and female leads who grow up together.
Male leads- Ning Que and Qin Lie grow against all odds, and gets more powerful with each near-death experience.
Both come from humble backgrounds, and rise to the highest level of powers that be.
The female leads- Sang Sang and Ling Yushi have hidden identities, are extremely powerful, and prophesied about as the great evils. Both are completely devoted to their respective male leads, and practically worship them.
The male leads on the other hand have romantic entanglements with other women- Mo Shan Shan for Ning Que, and Song Ting Yu for Yu Shi.
Both have amazing visuals, cgi and osts.

If you liked Arthur Chen Acting, then this one is also for you.
Also has Immortals as Theme and there are many other great actors and a great Story waiting for you as well.

Though if you searching for romance, the other Recommendations may hit that sector better.
Its more on the Cultivation Path of Things.

Same genre. Ever Night may have higher production values, but both are enjoyable for what they are. Very high quality effects and acting. If you're watching Oriental Odyssey, watching Ever Night in-between episode releases, is a must.

Both main characters secretly perform many tasks even under the eye of the king. They also both have secret identities.

A main character (FL vs. ML) is thought of as dangerous and hunted down/attempted to be killed by the "good" people. They are saved and protected by the other lead. Both have similar tones and settings, and excellent battle scenes.

Both have good action choreography and both stories have the protagonist learning fighting skills to prepare for the final duel in a revenge subplot.

Both male leads are young and their female leads always tags along. Both leads went to school to cultivate and became strong. Both female leads have mysterious/ hidden identy. Both male leads have multiple master/teachers. Villains are from certain sect/school

Entertaining big families that come close to heart.
The way both dramas deal with family-only dynamics is peaceful.
Full of comedy.
Heart-filling romances.
Double in-law couples.

Protagonist trains to become stronger and take revenge on those who ronged him in the past. He is naturally gifted but still needs to increase his spiritual power. In both stories they save the girl who then supports them on their journey. Protagonist has to keep his real identity a secret. While training, he makes friends who support him on his quest. Also, same actor playing the protagonist.

The fight scenes are amazing for these two series! They're both great dramas about adventures of the male lead all throughout the jianghu.

The male leads are somewhat similar in a sense that the story makes them the pivotal person of the court and the martial arts world (them being too important) but came from 2 different sides/ends - Fengnian is with the Overlord's side, Ning Que represents the royal family.

Another similar is the personality of the female lead being a very important person in the universe but is concealed/disguised as the lead's maid.

Also, of course, the most obvious similarity is Hu Jun. The roles he played are similar but different as well.

I get the same exciting watching these 2 dramas. Really great watch. Hope the season 2 lives up to season 1 though, because Ever Night fell out on the 2nd installment.