Recommendations

These have both a similar feel to them. Both have strong dominating rich ML and sweet FL. They are both high school / college settings.

love - hate relationship between the 2 main characters but they both ended up falling in love with each other. the break ups happened to protect the female leads, but both ended u[ together in the end

Similar in terms of face blindness by a main lead which leads them unable to differentiates between two aspects of the same person. They (person with the face blindness) starts to love the second identity of the main lead. Also face blindness starts to get cured with their love for each other.

There’s an electric youthful energy that propels both films forward. Shizuka Ishibashi plays both main female lead consumed by doubt, anxiety and fear of the mundane lives for which to be hopeful. If only they knew how to take that terrifying first step towards one another.

They are same stories-both different versions.
Tragedy,romance and revenge!
Very twisted and heartbreaking!

A bit funnier, but with dark themes similar to Addicted Heroin (also Chinese cultural references). The weight of family is heavy...also have explicit content and themes.

Both I can hear your voice & Maybe, maybe not have a main character that can hear other people's thoughts

Junichi is a man who is unknown, he travels around and wherever he goes he happens to meet a girl and makes her happy intimately and makes her realise what is wrong with her life in some way and shows her, without words, how to be happier.
In RDWCS the story concentrates on the lives of five people who work together. As the story goes on they all discover what they are doing wrong in their lives and some even find unexpected love.

!!mature content!!

I would say Junichi is more of a Psychological drama, whereas RDWCS is a Comedy.

Both have a 30+ woman and a bossy ML. Both MLs are running their own restaurant and cooking behind the counter. The ML gives dating advice and scolds the FL on her choices, while also sometimes stepping in to help. Both have couples that date others before considering each other.

unrequited love, similar in having friends with people who have unrequited love and struggling to overcome or stay in the relationship

MAYBE CONTAINS SPOILER

main lead has a tragic past
in both of them, there is a bad chairman who ruins others life by bribing police, prosecutor or teacher
also the main character suffers from injustice
(not) the main villain is psychopath

MAYBE CONTAINS SPILER

main lead has a tragic past
in both of them, there is a bad chairman who ruins others life by bribing police, prosecutor or teacher
also the main character suffers from injustice
there are a lot of romantic scene

MAYBE CONTAINS SPOILER

in both of them, there is a bad chairman who ruins others life by bribing police, prosecuter or teacher
also the main character suffers from injustice
and the main character tries to destroy bad chairman.
romatism is less than itaewon class but good.

Ok just hear me out, hah! Nietsche ALSO has a love interest who has/develops a strong degradation kink for the ML. The ML in Kono Otoko has a similar masochist/degradation/humiliation kink, obviously, but more on the physical side.

Similarities:
~Both have famous male leads and common female leads
~Initially both the couples had love-hate relationship
~Both the series encounters and deals with entertainment industry problems.
~Last but not the least, have pretty much same vibe with different storylines.