Similarities between these two dramas so far include: Jang Ki Yong, a forbidden romance, and serial killing.

Very different shows but gave me a similar feeling.

In My Holo Love, she believes she's in love with an holographic AI and has difficulties because she wants physical intimacy of another person.

In W she falls for a comic book character and suffers separation when they're apart in different worlds.

They don't have too much in common story-wise, but they give off similar vibes. The characters seem unique and refreshing in both.

An age difference of about 10 years. The ML falls for the FL first and a lot of the relationship conflict is internal and about the age difference. She's also pursued by other men more similar to her age. She has limited dating experience too.