Even though they have different genres; both are about students in school who are trying to get revenges.
And we have a weak hero in both drama.

Same history
Same political story
Pure love between a pure girl and a boy
University students.
Both are melodrama

Bothe Male leads have hyperthymesia , the ability to remember an abnormally vast amount of their life experiences in vivid detail.

Both are fantasy and are about hunting vengeful spirits and lingering ghosts.
Main leads have special power to see ghosts.

They have different gener but still in both drama, thet connect to someone frome past and try to change the present.

They have different gener but still in both drama, thet connect to someone frome past and try to change their fate.

Similar at the beginning.
Female lead loves male lead and the male lead dosen't show his feeling for her!
Both start in high school and continue to adulthood of main characters.

Bothe are about gaming. Both are action, fantasy and mystery with little romance.
We can see Same scenes of virtual reality and same feeling of excitement.
eventhough have different story and plot. But if you like memories of the Alhambra you might also like CrossFire.

Both are fantasy and kind of similar plot.
2 main characters come back to life with new appearance. Even though come back mister is comedy and hilariou :))
Abyss is combined with different genres like fantasy comedy romance and crime...

Bad guy who is actually nice... both are action and main chars want to revenge... both are romantic but not much.

Both are little mystery anand f full of excitement.
Characters work together to fight against crime and corruption.

Both are time-travel drama because of their first love and the guy is trying to change his destiny and make the girl love and marry to him.