Recommendations

Both are about Joseon man, traveling to the future, whenever their life in endagered and then meeting there the woman they fall in love with.

Both adress the private life of a person dealing with a horrifiying desease. In the one that person is an adult. In the other- it's not.

its all about the spirit of sportivity
even in the different kind of sport but u can see all about friendship, love n sport in one frame..
with a lot of hot guys there kekeke

SHARK is all about a band coming together and making a comeback after the death of the lead vocalist. The main character is another vocalist, like Eugene, that needs to step in. However, in SHARK, the focus is how the bad-tempered "God-sent" vocalist learns to get along with the rest of the band and helps them Keep Walking forward to achieve their dreams. If you liked Mr. Idol, definitely check it out.

Minor Spoilers: SHARK's ending is a bit sad but beautiful. Also, the sequel just derails everything, mostly.

The lead couple in both these shows have so much chemistry! Min Hyuk (SWDBS) and Tae Woon (School 2017) are perfect boyfriend material.

The shows also have mystery aspects to them.

- youth
- high school
- living together concept
- hate to love concept
- male lead is always the smarty pants
- parents always tries to ship main lead together

I get the same feeling after watching both of these movies. Not much dialogues going on but you still fully understand the situations through the character's emotions. And both movies touch the family issues, a kind of movies which makes you "think" a lot i guess.

Coming of age, high school students, finding oneself, basically the same theme of teen and discovery.

In both dramas there is an adorable leading lady and an equally adorable mother of the leading man. The mother goes to great lengths to match make for this couple..
Differences:
Itazura na Kiss' leading man is the typical cliche smart and handsome Jerk. He does NOT want to admit that he likes the girl, even to himself. The leading lady is adorable and sweet. She is not very talented but determined to better herself.
My Mr. Mermaid's leading man is dedicated to his sport but kind and sweet. He seems quite smitten with the leading lady, right away. The leading lady is dedicated to becoming a good reporter, but equally dedicated to being an honest upright person and good friend.

Itazura na Kiss is based on a manga and there were versions made in Taiwan, Korea, Japan, Thailand, and China... I loved them all. However, if you do not like going through all of those episodes, that make it seem like the girl is chasing a guy who is just not that into her, try Kiss Me(the Thai version) first. In that version, it is apparent, very early on that he has a soft spot for her, compared to the rest.

They have similar storylines.

Both have devoting wife. Loves their husband. Their husband meets another lady(in promise it's a rich lady).

Both couple in the drama have a young daughter. Both female lead have a another guy who likes them and wants to help them.

Both dramas that had betrayed their girlfriend have trouble relationships with the woman they chose to be with and end up running to the main female because they realise their love for them.

Both seek revenge
I watched both but fell in love with 'The promise' Because it's detailed.

The promise is a daily drama that consist of 102 episodes whereas the other one has less episodes and isn't a daily drama.

-girl must survive her life in the palace
-receives the King's interest/love
-has love for another

Both are long family dramas. Person Who Gives Happiness is much more makjang. The actress who plays the female lead is the same in both dramas. The plot and the feel of both dramas is very different but the female lead ends up with a very sweet and supportive husband in both.

Both are 100+ episode revenge dramas. Plots are similar: death of a child, crazy boyfriend stealing second female lead, etc.

Boh 100+ episode revege dramas with Very similar plots. Female lead goes to prison for a muder she did not commit. The revenge in YB is better IMO. The lead in SE is too nice and too naive.