Both drama contains supernatural romantic materials.Well, even being a fantasy sci Fi "My girlfriend is an alien" basically focus over romance .Lots of kisses and sweet jealousy scenes.Also slight fantasy materials.Amounts of humor is huge.
While alongside romance and comedy Fairyland lovers contains mystery materials.Both are worth to watch

Plots are not similar,but in both dramas Male lead falls for the female leads from the very first episode and try everything to pursue her.If you liked any of them you can try the other one
Although "Since I met" you is so much better than "She is the one."

Stories are not similar.But if you want to see some sweet rom com related to food then both dramas are recommend.

Both are recommend for fluffy romance lover.Fact is in both dramas male lead has a psychological problems.But the male lead personalities are different in these dramas.If you want a stress free, relaxing and healing warm rom com then watch Since I met you.
But if you want a push and pull romance type dramas with interesting plot then watch my girlfriend is an alien season 2.Both dramas are very much good rom com.

The plot of "Since I met you " is much simple and real life based story.Almost no toxic character .Meanwhile "My girlfriend is an alien season 2" is a fantasy rom com ,toxic characters is available here.Morever the plot of my girlfriend is an alien is deeper than Since I met you .

Pardon my grammertical mistakes.

Both are recommend for fluffy romance lover.Fact is in both dramas male lead has a psychological problems.But the male lead personalities are different in these dramas.If you want a stress free, relaxing and healing warm rom com then watch Since I met you.
But if you want a push and pull romance type dramas with interesting plot then watch my girlfriend is an alien.Both dramas are very much good rom com.

The plot of "Since I met you " is much simple and real life based story.Almost no toxic character .Meanwhile "My girlfriend is an alien " is a fantasy rom com ,toxic characters is available here.Morever the plot of my girlfriend is an alien is deeper than Since I met you .

Pardon my grammertical mistakes.

Plot of these 2 series are not similar.But the growth of the relationship between the leads are almost similar in these 2 dramas.Both dramas are sweet and fluffy.

The plot of "Since I met you " is much simple and real life based story.Meanwhile "Fall in love with him " is a fantasy rom com.