Recommendations

In both the main male protagonist is an only child who managed to accomplish his childhood dream (which was in one of the cases astronomy and in the other architecture), but failed in another aspect of his life (whether his health or his wealth). After this happened to him his childhood crush and later on fiance dumps.
In both the main heroine hhin't somebody unknown for the guy, but instead she ahad a crush on him sincee high school, but he was then very popular and with a girlfriend, so she chose to keep some distance from him. She is in both cases a very shy person who confront people when get angry, but even so sometimes taken on a lot of blame, which isn't hers.

So, not entirely the same. Scratch that completely not the same. However, it gives me the same vibes. I don't know why. There's a little comedy, but it's also very serious at times. Plot twists from what I remember were insane. Anyway, I would mostly just watch this if you really liked the partnership between two cops. It's also a tad romantic, or extremely romantic can't really remember, so if you're not into romance this is just a warning to you.

Both deal with the theme of reincarnation and have a strong supernatural element.
Only on episode 3 for now but Bulgasal is definitely a bit darker and has less of a romantic side.
TONT deals with deities while Bulgasal monsters.

Starring a much similar cast: Kim Jong Kook, HaHa, Jee SeokJin, Song Ji Hyo and Yang Se Chan. Outrun by Running Man is a spin-off series from the popular variety show Running Man. Both shows have activities, running, idol guests and lots of comedy.

DEFAULT is bout the economic crisis that led to the IMF bailout, an event that brought many foreign investors into the Korean marketplace in an attempt to stabilize the economy. The results impacted the average Korean family in a multitude of ways, especially to the tune of price hikes and large-scale unemployment. Black Money, also based on a true story, was born out of the lingering residual effects of that crisis.

If you love one, you'll love the other! Both are introducing new ways of rescuing people directly at the scene of incidents (the MER vs. the Doctor Heli), give us beautifully cheesy rescue scenes, and focus on the friendship within the teams instead of on romance.

Best mistake might be not similar to user not found. But WHYNOT fans should watch this! Best mistaks have 3 seasons so far and will be out the new season soon in this december ! Its worth watching. Goodluck and have fun!

Both cdramas depict life in high school with secret crushes and friendship. Both male leads are great basketball players and admired by their classmates. Both male leads act so cute when they are jealous.

I think this is so normal
I get the same vibe from both.
not in a bad way
first i watched 'my secret romance' really good drama
last i watched 'love is sweet' really sweety drama


SPOILER

people who knew each other in the past

Both dramas depict a love that crosses boundaries into another realm to change the past and the future. Both dramas has a lead that almost disappears from existence while trying to save the other lead.

Beautiful, sensual movies directed by Wong Kar Wai. Both take place in the 1960s, unfullfilled romance. The covers are also similar.

Both are beautiful, sensual and aesthetic movies that were both directed by Wong Kar Wai. Both also seem like character studies of the female lead where the male lead takes more of an observer role (2046 explores the male main lead more). The romance stays unfullfilled as well. Gong Li acts in both.

Both are romances with a big age gap between a male and a female. In both the male is older one.
Both have as a main hero a loner, who lives a lonely life even though he doesn't have any money issues. A person who only wears dark colours and lives for his work (which he regards as the mission of his life) and has established part of his past life in a foreign country (which is in one of the dramas Neitherlands and in the other Canada). In both he shares a house with another male, whom the female lead almost befriends... Both have many flashbacks about his past.
In both the female lead is somebody, continuing her study, who he encounter by chance. The female is the person who finds him first due to a misunderstanding.

Same format in that a fun panel of hosts watching and commenting on a dating reality show.

So if you liked the funny commentary aspect in either one, I recommend you to also watch the other one.

Both have the opposite attracts romantic comedy mixed with a bit of a catch-the-cultprit/murder-mistery.
While the genders in both hero and heroine are reversed they involve one main lead, which is calm, seemingly mature and well-educated person and another one, which is loud and lacks basic culture. Surprisingly they both make great couples.
Both leads (genders reversed) are surprisingly successful in their work even though their lack of education and do it from a long time so that they help their family.