When marinette (you) was a baby her parents had no money so they had to give her away and adrien's parents took her, but later adrien's parents passed away and adrien never told marinette what happened to her parents when she asked he just said they died, marinette knew adrien wasn't related to her because his parents did tell marinette that they took her in, so it was just marinette and adrien now and adrien bought a apartment they both stayed in, adrien was overprotective over Marinette.