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Both are Thai BL drama sequels where the story setting moves from university to workplace and they feature multiple couples.

Two people forming a friendship that is strained because of one person's being severely bullied.

FL pursues ML first
Very straightforward FLs
Strong, cute, kind and funny FLs,
Both MLs are very intelligent and well respected in their fields
Cute side couples
both shows have cute pets

Male lead had a crush on female lead....they met after many years ... She is now an NIS agent infiltrate his company... In the end she is an agent who becomes girlfriend with the ML

Simply put. The girl has a single-minded pursuit for a man she's fallen in love with at the first sight. The girls find ways to ensnare themselves into the lives of the guy, compliment their career to his. Their families get involved --- ie "GRANDPA".
There aren't really other players intervening into the relationship to cause problems.

Rather than programming & gaming. We're looking at architecture & manga/art (world) which was specifically pointed out in ep. 2.

Based on character personalities:
1. Girl - bubbly & Cute/ Guy - "Appears" cold but reasonable, overprotective; ill-mannered at times.
2. Girl - falls in love at first sight/ Guy - shocked but isn't annoyed by her pursuit
3. Granpa is all in for his grandson to be in a relationship & approves of her.
4. Both girls have Nian as their first names. ^_^

Lots of similarities w/ a few tweaks here and there. I love them both.

same actors same director.

Both films tackle abuse subordinates suffer in the military at the hands of their superiors.

Monsters and Politics. The Monstrosity of Politics and how it infects the common people. Dangerous, intriguing, beautiful, and a little humor.

Coming of age theme, a teenager almost at the edge of becoming a runway kid coming to terms with difficulties of family, school life, uncertainties about future, about coming to terms with them, finding his dream and pursuing them.

A teams forms to take down those in high positions that commit crimes hurting those who can't afford to fight back!

Both establish communication with the past with a device. I think the first one was the movie Frequancy (2000).

Similarities
- Both dramas revolve around family, sacrifice and regrets especially the relationship between parents and children + spouses.
- Both dramas have a warm feeling to it.
- Both dramas are have a parent as the protagonist - father in 18 again, mother in Hi Bye Mama.
- There is no real villain
- Both dramas highlight some social issues. 18 again: women empowerment, teen pregnancy, bias in society, etc. Hi Bye Mama: bias against step moms.

Differences:
- While 18 again revolves around love and hurt on a daily basis within a family, hi bye mama is themed around the pain when one is lost to death.
- 18 again is a lot more realistic and relatable and has only one fantasy element to it while Hi Bye Mama has more fantasy elements to it compared to 18 again
- 18 again's driving regret revolves around what could have been done if family wasn't there while Hi bye mama's regret revolves around what could be done for the family.

Similar plots:
- ML betrays the FL from the start
- ML hides the truth and falls in love (again) with the FL
- lots of misunderstandings/angst
- FL finds out about betrayal, love turns into hate
- super likeable, pitiable SML
- crazy (psycho) SFL

They both have excellent OSTs.

Both female lead have a cute personality
Both male leads are in a higher work position
Both male leads are a bit possessive of the FL
Both male leads try to protect the FL from a another guy

- both are short dramas
- both give of a simillar vibe
- in both bars play a significant role
- both are about two female friends and their relationships with men