Both deals with the show business world.

With We are all alone, you will enter the backstage environment. You will see how managers have to deal with problems caused by fans, rumors or even by the idol, actors, actresses themselves. You will see how they struggle and how the show business is cruel. This is a world where in one second you can fall from your stardom and it could be the end ... forever. Then, that's when the manager became important, they will help their stars to maintain their fame as much as they can.

On the contrary in Above the clouds, you will encounter the life on stage. You will see how hard it is to be a good actor. Maybe you have a pretty face, maybe you are quick witted and you can get the attention of people. But, to be an actor you need to be an actor. You need to act! In order to act, you may encounter hardships, once you overcome it you will see more difficulties yet that's how to build an actor.
In addition to, as people said, no pay no gain. You may hurt yourself, but sometimes that's what you have to pay in exchange for your carreer...

If you want some kind of revenge vibe with smart main lead, then you should watch Doctor Prisoner.
There are similar vibes.

both have birth's secret, and are about revenge.
It is airing right now but to my mind it is quite good. The two main actresses suits perfectly to their role.

The story is not similar but the theme does.
If you like drama related to the plane world with steewardess and pilot , you should watch this TVB drama. There's two season and one movie .

Both are base on the famous novel : Les liaisons dangereuses from Pierre Choderlos de Laclos. The story was about a lord Xie Yifang who decided to seduce Du Fenyu , a widow who seems to be his uncle's granddaughter in order to win the bet he did with Miss Mo . Indeed she promised him that if he succeed in seducing Fenyu, she will be her woman for one night.
He thought Fenyu l was an easy goal yet it seems like she is different from other women. Finally, he made it, she is in love with him but what unexpected is the fact Xie Yifang falls for her too. You can see she was the first woman he truly love. Miss Mo seems to be jealous so she decided to trick him. At the end, they can't be together even if they know they were meant to be.
Actually it is an interesting story with a SE.
If you want to know more about the french version , I recommend you the manga version drawn by Chiho Saitou. But if you like french litterature you can read it .

Both drama are about revenge. The main girl is abandonned by her boyfriend due to circumstances. Contrary to "Unknown Woman" the boyfriend is not a jerk! But what is important is that the main girl is Lee Yuri! She is so pretty when she takes her revenge!!!

Actually it is not a historical period drama like this one yet you can watch it if you hate the end like me. Indeed, Scarlet Heart 2 is the second part of Scarlet Heart chinese version. In this version , you'll see the two main leads in the 21st century.

Both are stories about medicine and particurlarly surgery. Despite the difference about the summary , you surely will like it too! Both dramas are played with great and charismatics actors!