Recommendations

Stories of male characters in conflict with state secrets during wartime. Similar color tone and same lead actress.

-2 male leads end up "adopting" a young girl
Voice of Silence is a lot more poignant and sad. Meanwhile, Pawn had its comedic and happy moments.

Awesome wuxia
Nicely paced suspense plot progression -- Both follow a series of smaller mysteries/arcs that build upon one another until the overarching mystery is solved.
Physically weak but mentally strong ML protected by butt-kicking friends/FL.
Some bromance

Similar plot .High school to college,self improvement ,first love and a wonderful group of friends.Also shows a very healthy relationship between male lead and female lead similar to Our Secret.

When you are old, doesn’t mean you have to give up your passion. It is hard to pick up the hobby you love because of life, because of humiliation, because of the society. Keep persuade your interest, for self for happiness. Both movies motivate people that age is just a number. Have courage to do what your heart tell you.

In both dramas, the female lead is rash and fearless. She has a goal and she's willing to push herself to the limit to achieve that goal.

Both dramas feature actor Li Zi Feng in a role somewhat similar: he's more kind and pensive while the female lead is the wildcard.

In both dramas, the female lead pretends to be someone she's not and manipulates people.

In both dramas, the main character goes undercover in the drug world after someone they loved is killed.

The main character is really good at improvising and at getting themselves out of tricky situations.

Both dramas feature a subplot with a scientist making drugs for the drug lord.

In both dramas, the female lead receives very quick training before starting her job as an undercover agent in the drug world. She forms a strong friendship with another woman during her mission.

Both of the dramas are about marriage of convenience where main leads fall into love after marriage. Hope you enjoy!

Both dramas have a morally gray lead who manipulates those around them and keeps you guessing about their intentions. Great characters and engaging stories.

Here's My Plan has more dark humor while JBL is more soft/melo, but they both have a slice of life feel and show characters dealing with difficult life and family circumstances.

Both have tough and assertive female leads whose actions you don't always approve of. If you liked the morally gray Jo Yi Seo from Itaewon Class, you'll love the focus on the FL in Here's My Plan.

Here's My Plan has a similar tough and assertive FL . You don't always approve of the FL's actions in either show but you slowly understand why they are the way they are and keep everyone at a distance. Similar dynamics, but Here's My Plan has more slice of life vibes while IOTNBO has more fantasy/melo vibes.

In both series our young male lead develops a strong relationship with a ghost. The circumstances under which they meet are very different however. In both they have to resolve whatever unfinished business or mystery the ghost has in the world of the living. They will also have to come to terms with the awkwardness of their relationship as a human and a ghost.

Both main leads have a mutual crush/love that lasts from high school until graduation. The main leads are also in the same friendship circle, which started because they were deskmates. In both dramas, the male lead is smarter than the female lead and helps her out in her studies. Both of them had problems during their university time.