Colors

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.

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.

Short romcom shows with a gay romance
male lead is a late bloomer with little romantic experience and becomes romantically entangled with someone he works with
lots of likable side characters
Colors' focus lies less on the romance (especially in the middle section) but i still think its an enjoyable show

Both are dramas that have very short episode run times so you can treat them like a lighthearted snack to consume during your busy day. Both include a more slow burn romance between two adult guys. Not many sets, these two spend a lot of time in the same space.
Very funny, sweet shows available on youtube for free.

Short japanese romance dramas tackling adult life struggles
- the characters in colors work in film, same with some of the cast in the boy and i.
- practically four main characters, two guys who are gay and kind of have/had something going on, a women with her own struggles and a more aloof camera man.
The boy and i generally has a more serious tone but colors also has some impactful dialogue

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