Not actually serious about it being mandatory, but I highly recommend you check these out! They have some songs that are actually much deeper and more meaningful than people give them credit for. They're such a great and talented group with an amazing team behind them. PD Rado deserves a lot of respect for that. The girls themselves showcase such amazing vocals, accurately portrating the emotions they want you to feel when listening to their music.
"Love" is a song about missing someone. It touches on the idea of love and the emotional roller coaster involved with it.
"Beautiful Monster" is about a rocky relationship. Some of the lyrics are translated to "You hurt me and then you heal me." Lyrically, it's reminiscient of "The Monster" by Eminem and Rihanna or "Psycho" by Red Velvet.
My favorite B-side by STAYC, "COMPLEX" is about missing someone despite trying to move on.