I found the two FL's family situation quite similar, though it takes up more of the story in Autumn Fairy Tale. The topic of the last 20-ish minutes is also similar, but it would contain spoilers, so I'll just leave it at that.
Both:
- leads get to know each other in high school
- one of them leaves without a word (FL - The First Frost, ML - Ten Years of Loving You)
- FL has trouble / drama with her family
- ML is a green flag, dedicated to protect and care for the FL
- they meet again years later (TFF - 8 years later (if i remember correctly), TYOLY - 7 years later)
- living together
- leads get to know each other in high school
- one of them leaves without a word (FL - The First Frost, ML - Ten Years of Loving You)
- FL has trouble / drama with her family
- ML is a green flag, dedicated to protect and care for the FL
- they meet again years later (TFF - 8 years later (if i remember correctly), TYOLY - 7 years later)
- living together
Both has:
- cunning FL and ML
- ML might want to kill FL at one point in the beginning of the story
- FL is no damsel in distress who need a prince
- amazing friendships and relationship dynamics
- revenge driven plot and characters
- poverty is a strong theme
- amazing actors
Difference:
- SoPG has romance, KMS has strong friendships and companionship between ML and FL
- KMS has heavier topics, SoPG is more business orientated
- more intrigues, corruption and scheming in KMS, but SoPG also has some of that, it's just not the main focus, like in KMS
- cunning FL and ML
- ML might want to kill FL at one point in the beginning of the story
- FL is no damsel in distress who need a prince
- amazing friendships and relationship dynamics
- revenge driven plot and characters
- poverty is a strong theme
- amazing actors
Difference:
- SoPG has romance, KMS has strong friendships and companionship between ML and FL
- KMS has heavier topics, SoPG is more business orientated
- more intrigues, corruption and scheming in KMS, but SoPG also has some of that, it's just not the main focus, like in KMS
- Both ML has the characteristics of animals (cat and dog)
- Leads must work together (Be my cat: to break their contract and solve a case , Husky boyfriend: to hide ML's secret while helping each other achieve their goals)
- ML and FL can't stand each other at the beginning, but throughout the story get to know each other and by the end fall in love
- Both ML's performances are awesome, especially portraying the pet behaviors
- Leads must work together (Be my cat: to break their contract and solve a case , Husky boyfriend: to hide ML's secret while helping each other achieve their goals)
- ML and FL can't stand each other at the beginning, but throughout the story get to know each other and by the end fall in love
- Both ML's performances are awesome, especially portraying the pet behaviors
Both has:
- contract marriage
- FL hides a secret from the ML
- ML is a public figure
- A killer that is threatening the leads and tries to kill the FL to make ML suffer
- ML tries to catch the killer with his own team, not wanting to involve the police at all
- ML comes to rescue FL on multiple occasions
- Both are good (binge-worthy) dramas
- contract marriage
- FL hides a secret from the ML
- ML is a public figure
- A killer that is threatening the leads and tries to kill the FL to make ML suffer
- ML tries to catch the killer with his own team, not wanting to involve the police at all
- ML comes to rescue FL on multiple occasions
- Both are good (binge-worthy) dramas
FL ran away, give birth to ML's child, then comes back years later. In both dramas, the kid is sick, and the SML is a doctor, and is close to the FL (in TLYGM he has a crush on FL and is her best friend, in RF he is her ex).

