Both deal with the weight of the expectations of others and the toll it takes to suppress parts of yourself to suit the people around you. Both have fraught familial relationships, though it's a bigger point in About Youth and not as heavy a focus in The Eighth Sense. They both have a nice, indie-style cinematography. The relationships are sweet and healing, both are about finding someone with whom you can find 'refuge'. They each have beautiful stories and a similar emotional weight and tone, though the Eighth Sense is definitely heavier overall. OSTs are a vibe.
Same actor. Same comedic/light tone. Both are short, easy entertainment. Puppy Honey has two main storylines with a straight couple featured as well, but if you're not into that it's also easy to skip through and still follow the BL.
Both are BLs with a light-hearted tone. Love By Chance is less comedic and more serious, but still has its funny moments. Both have lead's who are explicitly gay, rather than 'gay-for-you' and supportive mothers who play a role in the series.
Both deal with university students navigating their first gay relationship, neither have a major focus on actual school and moreso the extra-curriculars and relationships. They both take a more mature tone, though Together With Me is a little more mature based solely on how far the scenes actually go (*wiggling eyebrows*). They both have that sort of aggressive, "I love you but screw you" kind of dynamic.