Both drama have:
-a career woman with a soft/sweet side
-a young talented Main Lead
-Societal Expectations
-Female Friendship
-Strong 2nd Lead Presence
- the topic: what truly makes you happy

Both drama deal with age difference in relationships (older woman-younger man) and the topic of whether one should conform to society's expectations or not. Strong 2nd lead presence too.

•Palace drama dealing with its occupants daily lives throughout many years/decades.
•A smart, magnificent female lead who fell in love with a distrustful emperor that frankly speaking didn't really deserve her affection
•Though they both have a very realistic feel to them, Serenade of Peaceful Joy is indeed more toned-down and peaceful than Ruyi's Royal Love in the Palace.

The main characters are working as labor inspectors and the drama in general revolves around their profession through many cases the main leads encounter. Buuuut Special Inspector Jo deals with many other themes too while Dandarin Rodo Kijun Kantokukan is solely focusing on the work aspect

Firstly they are both fantasy drama. Both deal with prophecies, secrets and polital intrigues. And they both are one story cut in parts.

Both have
-a visually impaired heiress as the main lead
-who the male lead approaches for an other reason than the one they present, hiding their true identity in order to achieve a certain goal.
+the theme of "forbidden love"in both drama.

****POSSIBLE SPOILERS****





Both female leads undergo plastic surgery in order to make a new beginning in their life and get out of an unhappy marriage and the person in charge/helping them for the transformation is the male lead and romance interest.

Similarities between the two drama:
—Cold hearted male leads who at the beginning don't care/don't really like the female lead
—The girl chases the guy first and they live really close to each other

Both are based on Chinese novels
Both are painful but you cannot help yourself but be enthralled by the plot, OST, acting, cinematography and the tragic love of the main leads.
They both have supernatural elements(one less than the other but still)
The supporting characters stories are really interesting and add to the main story

Longing Heart and Reunited worlds are similar in certain points like how they are both time themed drama. Both without much focus on the details on how time was bent
—The school setting is important for the plot
—precious familial ties and moments. The main leads understand how their actions or absence affected their surroundings
—high school first loves

They are obviously cooking themed drama so they both:
— have restaurants settings
—deal with the rivalries and power plays that can happen in a kitchen
—Food food and even more food. Food bringing together our main couple
Also:
—arrogant male leads who have the skills to back it up
—love triangle(sls)
—cold man/warm woman trope

—Paranormal theme for the win.
—The roles are switched but one of the main characters needs the other for their "survival" and takes up a job to be close to them.
— slow burn romance.
—tragic past events shaped their present situations