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Similarities -
--> both MLs are wealthy but have a cold/narcissistic (sort of) personality
--> both MLs are CEOs at their workplace and are bossy and very particular in the workplace
--> both MLs are inexperienced in terms of dating and are secretly very innocent
--> both MLs are bothered by FL, who is not that financially well-off
--> both FLs begin working under ML
--> both MLs and FLs had an embarrassing encounter with one another before working together
--> both MLs yell and reprimand the FLs b/c they bother them but slowly MLs develop feelings for FL
--> MLs and FLs start cohabiting at some point in the drama
--> FLs are liked by two guys

Differences -
--> Clean with Passion is about a cleaning company while Monthly House is about a real estate magazine company
--> Clean with Passion is on the more cliche side, it can get a bit sappy at times (not a bad thing tho)
--> Monthly House takes cliches and makes them a bit more original
--> ML in Clean with Passion has OCD which makes him unapproachable and cold
--> ML in Monthly House is a workaholic and a bit of a materialist, which makes him unapproachable and cold
--> There is a classic love triangle in Clean w/ Passion while Monthly House it's a bit more complicated (almost a love square/ they may be hinting a love pentagon)
--> Monthly House spends more time exploring the stories of the other workers at the magazine company, while there isn't as much in Clean w/ Passion.

Members of opposite sex who starts off as strangers and come together under 1 roof to see if theirs sparks/interest to develop to something more.

- Both the original novels are written by the same author
- BROMANCE (BL!!!!!)
- Both stories revolve around immortals and cultivation.
- The Scum Villain's Self-Saving System and Heaven Official's Blessing (Tian Guan Ci Fu) is made into a Donghua.

If you like one, it is a given that you will like the other mainly because if the novel had done a wonderful job of making this universe. Both can take your emotions go through a roller-coaster ride as it has elements of comedy, romance, friendship and a bit of tragedy (?Maybe).

- Same author
- BL!!!!
- The whole concept of demon Vs Humans
The actors in guardian has done a wonderful job in conveying the emotions without making it so obvious. The looks that they give each other make you swoon.
(The CG is a bit off)

Similarities:-
- Leads hard working towards their dreams.
- Bickering couple.
- FL always sorrounded by a bunch of boys who support her.
- FL in a male dominated field.
- Cohabitation
- Both have sweet love stories.

Differences:-
- MUG has a cross dressing plot while FIYS doesn't.
- MUG is set in university while FIYS is set after graduation.
- MUG is a physical sport related while FIYS is e-sport related.

IF YOU LIKED MY UNICORN GIRL YOU'RE GONNA LOVE FALLING INTO YOUR SMILE

It is a cute romance of the two male leads... and them finding out their true feeling and accepting one another

-Both Office Romance
-ML's are both cold towards FL but secretly protect her
-Funny office staff side Characters
-Both ML's are landlords to FL's
-Cute ROM-COM
-Both dramas main couple has to work closely together
-FL'S have similar personalities
-enemies to lovers
-height difference

They both have deep story where main lead has to lie or be quiet to conceal the truth. Both stories are so touching that you will cry but still you will find happy ending.

monarchy of Korea is shown
parallel universes -monarchy actually doesn't exist now in korea
wars
forbidden romance
second male lead is the bodyguard

3rd season of the show. Different characters in a similar, yet different scenario. Episodes are short and sweet. Definitely worth it to watch.

Between Friendship and Love 3 is obviously the third season of the show. The episodes are short and sweet, but still convey the story well. Again, different characters but similar stories. Two people who live far from one another.

Second season of the show. They have different characters, but kinda similar scenarios? The first one is about two people who work together and live far apart, the second one is about friends who live far apart.

The main similarity between these two dramas is the love that makes sacrifices. The strong emotional charge that captures our hearts from beginning to end.

- Both are rom-com centered.
- Both have Boss-Employee romance set-up.
- MLs have similar personality.
- I won't say FLs are similar but both seems very dedicated towards the work they've assigned.

Similarities :
+ Strong female leads
+ Female centered plot
+ Thriller
+ Drama
+ Mystery
+ Death
+ Infidelity
+ Hidden past
+ High society
+ Power struggle
If you're looking for a shorter --dare I say better-- version of Penthouse, Mine is a great option.