also, here are the raws https://tkor144.com/%ED%94%8C%EB%A0%88%EC%9D%B4%EB%A9%94%EC%9D%B4%ED%8A%B8-PLAYMATE
That's what I thought too. I think people are rightfully freaking out about this but once you actually check the raws and observe everything, I think it's very clear that this was all his twin brother's doing and Hajun actually has no part in it at all. I'm glad that Danwoo catched on very quickly and Hajun also comforted him. I just hope that in the future chapters there won't be anymore twists (*﹏*;)

hey yall about the twin thing. the twins have not been swapping places the whole time. the seme has a twin brother and the twin seemingly is jealous of the seme so he intentionally tricked danwoo into sleeping with him ONCE. it happens in the next few chapters, and danwoo notices it really quickly. after interrogating the twin, he goes home and immediately tells the seme everything. this is not one of those stories where both twins are sleeping with the same person and tricking them/swapping places