I think the whole twin thing is pretty obvious at this point. First off, that scene where ...

I think the whole twin thing is pretty obvious at this point. First off, that scene where one of them was wearing a hoodie while the other was literally in class at the exact same time. Also, when the MC slept with one of them and asked about his opinion about him—he got all annoyed when he said he was cool or whatever but then got super happy when she mentioned his bad mood and a completely different personality from the first description.
And now in this chapter, how on earth did he get back so fast from their date? And Why is he acting so weird when they were literally just on a date a minute ago? Plus, the sudden change in clothing style—I've never seen a male lead completely flip his style out of nowhere in the middle of a manhwa. and I'm pretty sure there was a scene where one of them was texting his older twin. Last but not least, the manhwa cover literally shows two leashes in different colors. Man, screw this story