While Mask is a deep melodrama, Goong is just a typical romcom.
But still they have some commons:
- Ji Hoon as male lead
- A contract marriage, where the guy cant the girl, his wife, at the beginning and is mean to her
- A female lead, who comes from a poor family and just married into a rich family to help her own family out of financial issues
...both dramas are defintely worth watching.

Both are: nice and poor girl has to marry an arrogant, mean and rich guy who is already in love with another girl.

When you enjoyed one of this drama, you will enjoy the other one, too. Main leads characters are the same:
The guy is a weirdo, getting annoyed fast by the female lead, and is arrogant and sometimes mean. The girl is cute, very nice but also pretty naiv. Fated to Love You is about pregnancy/marriage while Youre Beautiful is about band life/music. But relationship of the main leads is pretty similiar.