Nibiiro no Hako no Naka de

Both are about a group of high schoolers who grew up in the same apartment building and are now involved in a web of romantic/sexual relationships with dark emotions and motivations being rampant.

it revolves around love triangle in the friend group and it also took the troupe where FL's best friend got jealous of her because she's pretty and the ML likes her.

Although it's not really the same but when i watch this drama it reminds me of bokura wa koi ga heta sugiru