Recommendations

Both are boys love dramas taking place in high school.
Produced and released by GMMTV
SeaKeen play the main characters

Both are boys love dramas produced by gmmtv taking place in some kind of educational institution (school/university)
Both star SeaKeen as the main couple.

Both are gmmtv boys love dramas that have the same director (Champ)
One of the leads is very popular and openly expresses his affection towards another guy who is kind of confused by this, yet, they grow closer anyway
Music is really relevant to the plot too

Both are boys love shows in which the characters are high school atheletes.
Central trope is enemies to lovers

Both are boys love dramas in which the main characters play basketball and are part of the same basketball team
They have a long history together, hence why one of the leads wants to keep more of a distance between them while the other persistently tries to get closer

Boys love shows taking place in high school with a male lead that is an athelete that is very serious about his sport and salvaging his reputation as he depends on it to get a scholar ship
Gets close to another guy, who is persistent and whom he has a love/hate/hate to love relationship with

Both are SPORTS themed boys love show taking place in high school.
The main characters have known each other for years but hold some kind of negative feelings towards e/o. They come to fall in love, though.
Both feature PING in a main role!

Thai Boys Love dramas with a high school setting.
Unexpected romance
coming of age
Teenage characters being played by actual teenagers

GMMTV produced high school BL
light hearted, sweet, fluffy, comfort shows
KenPaul play side characters

They are very similar in the sense that
- both FLs are working as a prosecutor/ government based lawyer
- both MLs have done shameful things in the past and have been involved in violence
- the MLs are essentially hiding in some way or the other their other life
- both the couples have a sort of refreshing and natural romance vibe. Like you feel comforted just watching them together
- both MLs save the FL in some way or the other without her knowing
- both have happy endings

Although their tone differs, OSL is a rom-com first and the mafia elements are used as a plot point, while it is almost opposite in Undercover which is a thriller first and romance second.

Similarities: Max cringe, super fun. Both series feature a young man stepping into a fantasy world without any prior knowledge to it and being forced to live with a stranger that they develop feelings for.

Differences: Knot is an Omegaverse and My Golden Blood is a vampire series. Knot is very smutty/nsfw and MGB toes the line between PG-13 and MA18+.

Kinda while watching this movie remembered Friend Zone movie. Overall idea is same friends seek love, but dont see each other.

Thai Boys Love dramas produced by GMMTV and directed by "New" Siwaj with a high school setting.
Both shows are each respective pairing's second work after staring together in Boys in Love.

Main character, who is actually an adult with some regrets, find himself transported back to when he was a teenager/teenage age.
Good Boy > BL
55:15 has an lgbtq+ subplot but follows multiple main characters navigating culture shocks

Well,
1. BL series
2. Author (one novel and the other is screenplay)
3. Age gap

I don’t know what else to write but both are pretty much romance comedy with various flavor (I believe if BOTW has more episodes they could make the plot more convincing and easier to understand)