Recommendations

-academic rivals
-smart leads
-secret crush
-competitive and hardworking fl
-ml is always there to help fl
-bickering couple

first of all! the amazingly deep dialogues and theories about life from each character perspective that really sticks with you.
-slow paced with gruadually blooming romance
-deals with problems about family as well as survival in today's world
according to me both the dramas give a very comforting theme where instead of pining over any kind of villanizm and waiting for a typical hero-villain knockout, u just sit back and relax while watching it. your mind is stimulated in a very deep way which makes u internally satisfied
it has heart touching dialogues and carry a similar slice of life theme

Both dramas are with a male lead, starring Takezai Teranisuke, and have love stories about couples with big age gap.
In them the couple's connection seems like a whim at first and we slowly watch them fall in love after their first meeting (we witness the love growing) and both leads trying to communicate their inner feelings.

Both series have a female protagonist whose rather unassuming to start with. However, these same unassuming protagonists grow and change once they begin building, customizing and altering these ordinary puromo (plastic models) into their own unique pieces.

One is students joining gang, the other one is student joining swindlers . Both were is bad business at the beginning, but conscience kick in and became a good bad person

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...The Case Solver II is a sequel of this drama, also it has the same characters which are the male lead and the female lead remain to be Jason Gu and Dong Xuan.. and as well as some more other characters..

Housewives 'liberating' themselves through steamy affairs!!
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There's also a cute love triangle involved (also similar to cute/smart guy + bad boy) that I believe makes it very similar to this show :)

a sincere romance between a country boy and a city boy. Both struggle to find their true selves and sexuality.

Both MLs are wealthy CEOs who have a traumatic past and issues as a result who end up cohabitating with the poorer FL. They later find out they met in childhood.

Both have a FL in a entertainment/fashion industry (makeup and livestreaming vs. singer and later clothing designer). MLs are cold at first then very doting when they fall on love. The secondary couples are very similar in both shows with a softer male who chases her vs. colder more distant female who pushes him away at first.

Both MLs are wealthy CEOs who have traumatic pasts and issues as a result. They hire FL (as a contract wife vs. bodyguard) and begin to heal as well as fall in love. There is a past connection between the two.

Dear Diary and ZGSSBGXQ both feature ML that resemble one another quite a bit in both looks and personality. The humour is similar at times, even though there is no time travel element in ZGSSBGXQ, the humour is all modern satire.

both of them have this kinda dark and mysterious vibes and more gray characters instead of all good and all bad characters.

i think people who liked GFN will also like All of are dead

it has a kinda dystopic zombie apocolpyse topic like train to busan as it was mentioned on the show as well