-Death Bell is more to the horror side but both are about death game that the studens should pass to survive.
-both are gore-thriller

-both are about healing time for the members where they sleep outdoors, cook, and have fun.
-both take place outdoors in nature with the hardships of camping stuff.

-both are about relationships of multiple coples, but 7 Something separated them in different segments.
-both have their characters learning something new from their couples.
-both are light-hearted romance

-Both stories focus on relationships of multiple couples.
-Both have light and fluffy romance with hints of comedy.

Very different in concept, plots, even genres. but how the leads' psychology create a new personality—which change their lives in process—without them even realizing it is somehow similar. Might be too soon, but we'll see if it really is the case.

Children of nobody points out the psychology, while Secret Forest is more to the politics, but I did spot some similarities
-Children of Nobody is much darker than Secret Forest but the crime cases occurred bcs of the quite similar 'perspective' that the character had, which make them be in ambiguous side (good/evil).
-The collab between ML and FL that are from different job.
-both are somehow melancholic on its own way

they have different stories, different writers, etc but they are really similar as they both tell story about heists. The collaboration between the heists and people from various professions is also what make them very similar. Not to mention both of the leads are notorious for their high level of skill which lead them to be asked & supported to do a big scale project by a conglomerate.

They both are different in plot and atmosphere but i spot some similarities like:
-Both dramas tell about someone who is wrongly accused due to all the evidences that lead to him but he denies them.
-Also in both dramas there is an only lawyer who's willing to help the defendant (although the lawyer from each drama has very different perspectives), but still not making it easy on the defendant.

- both shows have chilling, heartwarming romance
- both FL are actress
- both shows have main roles with special condition, that lead them to attract and complete each other

- both shows tells story about prison life/survival and have their characters developing time by time
- the main role from both shows accused guilty of their (too much) self-defense act
- both main roles were initially athletes
- both shows have comedies despite the prison life hardships
- Shark has Ahn Hyun-min character and Prison Playbook has Beobja/Jailbird character which I think both have quite similar entertaining vibes