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The male leads are similar in that they both kick ass (in a, according to them, moral way - i,e, no killing), fall for a girl (payed by the same actress might I add) and then end up spending like half the drama protecting her.

The Korean version of the manga 'Itazura na kiss' that came out in 2010

Both of these wuxia dramas have a main male character with stigmatized powers and familial ties that place them in difficult situations. Both leads are raised by merciful strangers who gently refuse to teach them special fighting abilities. Due to tumultuous times and unforseen circumstances these leads must master their inherited powers and defeat the evil hordes.

It's not quite related to the plot or characters personalities but while watching "Again miss Oh" I got the same feeling as I watched "Discovery of romance". Both dramas have interesting characters that you can't really hate. Also, both are good rom-comedies with lots of emotions filled with love, anger, hate and regrets. Both are more mature than usual kdramas. And, also, Eric are leading guy in both dramas!

Both are hilarious and have wonderful plots. In both the dramas the female lead hides her real identity and becomes a maid. only thing is in DRRT the female lead pretends to be a boy. Both are enjoyable and you will definitely like it!!

only one thing that I found common was that both the female leads are shy and bad at expressing their feelings. in the start of the series it is shown that female leads were ignored and lived quietly. Then there comes the famous male lead (in FBND he is popular game designer and in TGH he is a superstar) who changes their life. there is a love triangle and many comedic events so you will enjoy both.
Other than that one is Korean and the other is Taiwanese plus TGH has a school setting. But both are enjoyable.

Both dramas involve music theme.
The leads live together.
Both female leads are oblivious to their feelings
Both main lead are a little arrogant but care about the female lead secretly.
Both have various comedic events.

The diference is YB is gender bender while TGH has a school theme and one is Korean and the other is Taiwanese.
Overall both have a cute and sweet atmosphere!!

Both dramas focus on extreme bullying in school and overcoming it. While Who Are You: School 2015 has more romance involved and more of a story outside of the bullying aspect, the feel of these dramas reminded me of each other.

Both are dramas with the same kind of psychological game show format where people have to face themselves and their true selves are revealed to the public. Both involve a complicated connection between the characters that is revealed over time. They also have the same kind of pacing and the villains remind me of each other.

Both show have criminal profiler as a lead. Eventhough, they have different story concept, both shows were superb and had masterpiece stories.

The Reason behind this is it another Kim Hyun Joong Drama. Honestly I would watch Boys Over Flowers first then watch Playful Kiss.

The male main lead are both disguise to save people. Tho, Healer contains more romantic scenes than Bridal Mask, but either are great drama and worth to watch!

Cold guy, who has problems feeling and expressing anything at all, melts for a flamboyant, lively, slightly silly girl. She literally warms his heart but he remains cold to everyone else. the supporting characters are great too and the guy's family likes the girl 100%.