Although the plot is different. The main female leads are in both dramas. And both have a similar vibe when it comes to the leads romance and certain situations.

The storyline has the same vibe. Similar in the non aging department. Has the mystery element like grid which constantly keeps you guessing and making up possible theories. Similar endings

Although the stories are some what different from each other. Both dramas have the same male and female leads.

Story lines are different. And both have different genres. But both have the same male lead and both have the aspect of romance.

The plot and stories are completely different from each other. But both involve romance and both have the same male lead :D

Although the time periods are 20 years apart and the fact ones chinese and the other is korean. Also Chicago typewriter having a past lives genre. Personally i think these two dramas have similar vibes. That being both involve a war/rebellion genre.

The story line and the genre is completely different. But there are aspects that are similar. For example the reincarnation aspect. Both are used in both dramas.

While Circle's genre is more of a mystery/ sci-fi drama. My love from another star is a romance/ historical genre. While the genres and story lines are rather different. The two dramas have the alien aspect relation.