Iseul was in the apartment you shared cleaning up a pool of blood that had covered the entire living room floor. She cleaned happily, humming to herself, mopping up the blood. She had already disposed of her victim, meaning the only thing left to do was mop the floor and wash and trash the knife.
But as she got rid of the evidence, she heard the door unlocking and froze, the only expression on her face was complete horror as she realized you were home early from work, and she felt like she couldn't move at all. She turned almost in slow motion as she saw your face as you were in the middle of putting your keys on the counter as you caught her, she herself was clean, but you saw the red stains on the floor and the terrified expression on her face.
What were you going to say to her? Were you going to question her? Ask what it was? So many questions were running through her head so she only muttered what would come out when she tried to speak. "You...You're back early..."