I didn´t watched neither until the end, but it really felt similar.

-The plot is all about revenge
-We have crazy mothers and women in generel
-Both of them are alot about families and how bad they treat their children
-The Male Lead is a bit flirty with the Female Lead and kisses her forcfully sometimes
-In both the Female Lead stands behind a family member, even if they treat her like literal trash (In Fai Sin Chua it is her mother and in Hua Jai Sila her mother and sister)
-**We have a kind woman, that dies because of the mother**

-Both are friends to lovers
-Both have a bickering couple
-There is a secondary couple in both of them
-The Female Lead gets cheated on in both
-Both are light fluffy and funny dramas

Both are light fluffy dramas where friends become lovers. They both gave me a same feeling while watching.
Both couples are bickering couples and they joke a lot with each other. The chemistry is so good in both.
In both the Female Lead is first in love with someone else.
We have an Second Female Lead that loves the Male Lead but he doesn´t love her back.

I only watched Dance of the Sky Empire till the end but I still saw a lot of similarities especially with the romance part.

-In both the ML falls first
-Both have a ML that would do everything for the FL after they fall in love
-Both FL are smart even if it´s not THAT outstanding
-Both FL have a goal and both goals has something to do with going back to their normal lives
-The comedy felt similar to me
-Both have a SL that falls for the FL later on
-Both have another couple where a princess falls for the normal guy, who doesn´t stand out much and both guys think, that the´re not worth it
-Both ML are romantic when they admit, that they love the FL
-Both ML saves the FL a lot of the time, even if the FL doesn´t realize it
-Both ships are bickering couples
-In both the ML gets really jealous
-In both the FL is good friends with the SL

-Both have an overbearing CEO
-Both Female leads are poor but don´t want to take the money from the Male lead
-Both Male Leads are rich and always think money can buy anything
-Both Female leads are hardworking
-Both Male Leads are a bit possessive and obsessive
-Both Male leads bring up exuses because they don´t want to accept the fact, that they fell in love with the Female Lead
-Both are from Hate to Love

Am I the only one that sees a lot of parallels?

-Both are chinese dramas that are about a rich, cold Male Lead and a cheerful Female Lead
-Both Male Leads have a problem with touching woman/people (Although the Male Lead in About Is Love can´t touch people in general and the Male Lead in Master Devil Do Not Kiss Me just can´t kiss girls without having a allergic reaction)
-In both dramas the Male Lead is interested first but the Female Lead rejects him all the time
-Both dramas start with a Love-Hate Relationship and even after they don´t try to kill each other anymore, they still bicker around
-In some point, both dramas deal with art
-Both are dramas I really loved and gave a good rating
-There is even more but I forgot about them...

I think if you liked one, you like the other as well.

Both dramas have a Male Lead that loses his ability to taste and the reason for both of them is because of mental health. Both Male leads recover their sense of taste because of love. Both dramas are about food.