- Both are documenteries
- Both are about elderly couples
- They show the everyday life of the couples
- They have the same director

- both have a murder in episode one with everyone present being suspects
- they have plot twists and suspense
- they slowly show how apparently innocent characters have hidden motives
- the end is satisfying with no unanswered questions left

- both dramas feature a mentor figure who teaches law to his younger mentees
- they talk about the meaning of law and justice
- they have mock courts
- neither has romance as a significant part of the plot
- the central figure is a middle aged lawyer with integrity and charisma

While watching Hospital Playlist, I had deja vu like moments that reminded me of Soul Mechanic. Both are showing the private and professional lives of people working in the health care system. They also both tell beautiful and sometimes heart-wrenching stories of the patients and their families. Many scenes are about the doctor visiting the wards in the hospital and interacting with the patients.

The girl in both stories is a high school student who went to a meeting instead of her older sister. When the switch is discovered by the male lead, he doesn't want to give up the relationship with the younger girl.

In both dramas there is a prince and a spunky girl who get married early on, but the couple takes some time to fall in love and live as a married couple. They both have some palace politics and the struggle for the crown prince position.

Both have a female lead coming from the modern world to the ancient world and inhabiting the body of a previously existing person. The male lead teases her and wants to make her fall in love with him. The second male lead is the lover/fiancé of the original female.

Both dramas have a sweet, slow romance between the main couple, while there is still a man "hovering" around the female lead, that her parents and society expect her to choose and marry.

The shows are similar in the aspect that the female lead has psychological problems and the male lead is helping her through (tough) love. At the same time the male lead also receives healing through the female lead.

Both stories are about a couple who is physically intimate with each other and how physical intimacy also creates emotional intimacy.

In both the male lead is physically very fit and a good fighter and with his skills he rescues the female lead from danger. He watches over her and she feels protected because he is there for her. The antagonists in both are scheming politicians, so the male and female leads are helping the good side to win.

Both shows are about two people who meet on Jeju Island and fall in love. I actually got confused when I was searching for one of the shows, because their synopses sound so similar.