Both star Son Hyun Joo and feature a strained father-son (or father figure) type relationship that results in crime and tragedy.

Leads who haven't seen each other since childhood reunite in adulthood, and initially believe each other to be half siblings. Female lead turns out to be unrelated (biologically) to the main family.

I've not seen the Korean Good Doctor but I know it's plot from the American remake. Lead characters are judged and the conversation of whether or not they should be allowed to perform surgery with their conditions is a prominent theme.

Hospital setting. Doctor male lead who is cold/reserved in personality, desperate to save female lead from their medical issues.

Hospital setting. Female leads are medical staff that face discrimination in the workplace due to their own health issues. Both also feature a healing romance arc with a coworker.

Male lead of Devilish Joy has the exact same condition as female lead of Unmet. They both have their memory limited to one day, and leave notes to help themselves when they awake the next day with no memory. They also cannot remember knowing their romantic lead prior to the accident that caused the daily memory loss issue.

Ensemble/team cast, investigations done in a heavily comedic atmosphere, male lead and female lead banter a lot, etc..

Identical in main plot: Female lead loses memories, male lead pretends to be her romantic partner for revenge based reasons. Both parties fall in love along the way.

Female leads both meet and develop a romance with their celebrity crush. Triad Princess is more upbeat and comedic while KMSD is more serious and heavy.

Female lead goes undercover in the mob world and reunites with her past teen love while there. Struggles with completing her mission due to previous personal feelings reigniting.

Mobster male leads, male and female leads have past childhood/teen connection. My Sweet Mobster is heavily comedic with occasional serious undertones, Fatal Allure is solely serious and often reads as a soap opera.

Mobster male lead unexpectedly falls in love with country-type girl. Kang Koo's female lead has a child, Lovers' female lead has kid siblings, etc..