Secret Relationships

It's not too similar but i kind of get the psycho vibe of both jin and jaemin being like "im the only one that can have him and stuff" but i think from how far i am in secret love its more toned down than secret relationships but they are both amazing BL's in my opinion (edit: it gets past the possessive bit fast but they are both still a bit similar)

Also has 3 male characters interested in 1 guy; however, Light on Me is set in high school/gentler than Secret Relationships.

Both are Korean BL dramas with broken families, red flag love interests, toxic behaviour and love triangles. Both also have a love triangle (or square). There are 3 guys liking the same guy in Secret Relationship and 2 guys liking the same guy in Let Free the Curse of Taekwondo.

--good tension b/w leads that gives butterflies
--if you're looking for toxic relationships in drama lol (don't worry the ending is satisfying )
-- well written story with angst