Recommendations

If we're talking about "Genius" this would fit the category. He's medical examiner who specializes in rare diseases. He assists with crime cases suspected of involving perpetrators with rare conditions, and offers plenty of unique medical insight while teaching viewers a thing or two about a few rare diseases.

The main lead is thousand years old and the girl is young and naive.
Nonhumans live among people.
Same comedy feel, funny bromances.

Both characters want an outlet from their worries and problems so they went to a remote place. They are both angry to the important people in their lives. They want to getaway from reality.

Similar plot of haunted women who goes a lil bit crazy and both were intended to be "horror" movies, but since Koreans simply can't make horror, they ended up being good thrillers.

Both fathers of the main lead was sentenced to prison for the crime that they did not do and being threatened to admit to the charges with the safety of their child. They are both not able to defend well for themselves due to one having Alzheimer's Disease and the other being intellectually disabled.

If you love school delinquents (and you know you do) fighting to reach the top for different reasons and finding meaningful friendships along the way, you'll love every Crows movie (based on very famous mangá series) just as much as KO One and the K.O. series.

Set on the same world of K.O. but not really a remake or side-story, K.O. One is a crazy school delinquent drama with tons of bizarre superpowers and even supernatural elements, and the three series are very fun to watch if you love school delinquent fighting for the top ranks and crazy stunts!

Though K.O. takes a (later) crazier approach on school fights and tons of bizarre unbelievable superpowers for the main delinquents, both series are very fun to watch if you love school delinquent fighting for the top ranks!

Both series are based on successful mangás of the same genre and have the same high spirits of delinquent students fighting to reach the top, each one for different reasons, and that leads to creating meaningful new friendships along the hard way.

Both series are based on successful mangás of the same genre and have the same high spirits of delinquent students fighting to reach the top, each one for different reasons, and that leads to creating meaningful new friendships along the hard way.

Both series are based on successful mangás of the same genre and have the same high spirits of delinquent students fighting to reach the top, each one for different reasons, and that leads to creating meaningful new friendships along the hard way.

Both are based on famous sports? baseball manga by Adachi Mitsuru.
Both star Masami Nasagawa as main female character.

Both are based on famous sports manga by Adachi Mitsuru.
Both star Masami Nasagawa as main female character.

Both are based on famous sports manga by Adachi Mitsuru.
Both star Masami Nasagawa as main female character.

This is the first season of this drama and both has similar story setting:- a strong-headed heroine (definitely not the damsel-in-distress sort) who had lost her memories of her childhood friend being trapped in an endless cycle of going in and out of different stories where each time she will meet the same guy (playing the male lead) and they will both fall for each other but get separated once her mission for each story is completed. The male lead ended up going from one story to another in the hopes of meeting her again. In the end, they will meet in real life and the back-story on what happened to them will reveal itself but that's something to look froward to in Season 2. This is similar to The Journey with the only difference is in The Journey, the female lead had to complete missions through different historical periods (time-traveling) while the male lead(s) searched for her through time. If you liked The Journey, you'll love The Story of Souls from Endless Books.