My Girl (2005)

Both dramas involve cohabitation, 2 Male suitors, & a hotel setting. The vibe for them also feels similar.

Both are classics must watch to me.
The leads meet casually and become "partners in crime". Both MLs are in love with someone else at the beggining but, when they eventually fall in love with the FL, they can't easily get a happy ending because in My girl they have to fake they're cousins and in My princess they're apparently enemies.
Very interesting plots, with many moments that make you laugh and others that make you cry!

Rainbow Sweetheart is the Taiwanese version of "My girl"

If you liked My Girl, you might like Just You because they're about the main characters living together and falling in love. The male leads are the 'boss' and the females are the 'employee' in both dramas. (I personally liked Just You better)

These are two of the funniest dramas ever for me. Plus, they are both written by the Hong sisters.

Both dramas has very similar comedy and both are dramas by the well known Hong Sisters.

If you liked my girl for lee da hee you would definily like marriage no dating the same concept of a man bring someone home to Fake their relationship in my girl as cousin here as girlfriend and the same beautiful romance with completely funny scenes also Han groo has same attractive spirit lee da hee had at my girl :)

The plot is really similar, hiring a girl to pretend to be sibling.

In my girl also the two guys are friends.
One of the guy is a playboy.

An person is hired to play the part of a long lost family member to appease a dying family member forms the premise of both stories.