Recommendations

Both are short Chinese BL dramas with very similar vibes. Set in the summer, surrounded by lychees, question of fleeting romance or something more.

They are both wuxia dramas, with strong FL's and ML's.
For both the FL's come across as weak but are secretly as strong if not stronger than the ML's leads.
They are both "touch her and you die tropes".
They are also both "she fell first but he fell harder tropes".

They both are about a parent who takes revenge for their daughter which is killed. Also the daughter in both is bullied to death by their classmates where their parents finds out and takes revenge for them.

Boys love dramas with the same actors playing main characters/the same main pairing (UpPoom)
- forbidden romance
- Nc content
etc.

both are boys love dramas with darker themes, crime/solving a crime setting
the mcs start off as enemies due to being/having been on two sides of a spectrum (in Trapped one is a gangster, the other is a police officer, in Prosecutors proposal one is the son of a 'murderer' the other is the sun of a murder victim)
the characters are interested in uncovering the truth behind a case/murder
have to work together against all odds which brings them together romantically

Both are short japanese indie/low budget dramas uploaded to youtube with subs. Both feature a romance between two guys too.
Shujin-Ko, though, focuses on multiple mains and on college/university students while colors is about 30ys/40ys and more "grown" struggles.

Raw, devastating, brutal coming of age stories. Focus lies on several (queer) high school students who have to deal with (extreme) school bullying, homophobia, having to hide their identity and struggling to open up to others, and even S/A. Theres kind of a romance between two characters and some solidarity/friendship building but dont expect happy endings for all.

Both are short and sweet japanese gay love stories. Male lead, despite being thirty years old, has not made any sexual experiences ever, is very inexperienced when it comes to love and generally a little socially awkward. After he turns thirty, though, he becomes unexpectedly involved with another guy whom he works with.
(Plus theres a delivery guy side character in both)
Colors is less of a romance, though, and more of a slice of life story.

Married to My Enemy is the special episode(s) for Enemies with Benefits. You will need watch that before this.

Both are short indie boys love dramas from Japan. The main characters are adults working in/with media (book, film).
- Characters meet again.
- Same director
- similar title lol both about colors

Both are very good korean movies.
Both have sad endings.
Both of them have subthemes of friendship.
One of the main characters like things such as art and photography.
Have highschool themes.

similar concept of several people from different backgrounds living under one roof, for relatively long time, doing various things together

Both are a sci-fi genre that include dream escapade.
AiB3 does really remind me of this one than its 1st season cause both faced the "game/dream" mastermind.

similar concept of several people from different backgrounds (mostly actors and idols) living under one roof

These movies:
- are about lesbian life
- have the same calm vibe
- the sea features in them
- have similar sad themes