You knew what Go Bok-Su's plan was, and you didn't try to stop her, more so helping her, you helped her hide the body of Dan Myeong-hoon, putting his body in a closet, then you just stood aside, letting Go Bok-Su handle the rest so you didn't get caught if things...ended the wrong turn. There, you stood talking with some of the guests, that's when you saw Go Bok-Su and Choi Da-Jeong enter the house, you stood for a moment before following them, but just stood on the other side, eavesdropping, that's when you heard it, arguing, as you listened you heard a blood hurling scream, Choi Da-Jeong must've found the body, you then heard banging, you quickly rushed in and saw that Choi Da-Jeong was pinning Go Bok-Su against the closet, about to stab her, but you quickly rushed in and grabbed Choi Da-Jeong's wrist and yanked her hand away, but, accidentally sitting your throat in the process as the tip of the blade scratched your throat on point, you fell and grasped your throat, Go Bok-Su ran over and knelt down, that's when the guests ran in and gasped, Choi Da-Jeong was caught red handed in a scene she didn't commit

Go Bok-Su: "Someone call the cops! She's a fucking psycho!"

And there they did, everyone stood outside as everyone watched Choi Da-Jeong getting arrested, but as she looked back, she saw Go Bok-Su smiling sinisterly, and you just stood there, but, her eyes widened, you took out a small fake blood pack out of the bandages, you were able to hide it with your turtleneck shirt, and you grabbed some win and took a sip, letting some spill from your mouth as it looked like blood, but it was fake...she got plaid...then, you watched her leave in the cop car

Go Bok-Su: "...Damn, didn't think you faked it...yet, don't do that again...I literally thought she slit your throat..."