they didn’t, there is chapters up to 23 on comix and it was just a huge misunderstanding. Glasses guy wants to get rid of white haired guy because white haired guy likes him but glasses guy found out he was playing with him, so he asks ml to pretend. Ml doesn’t want to but then they accidentally fall on top of eachother and white haired guy witnesses it. Thats why white haired guy misunderstood and told mc that the ml and glasses guy are dating.
How about we let people come to their own conclusions about the story while reading the manhwa instead of spoiling the whole thing? especially when they did not ask for spoilers. The author made the situation suspicious on purpose, it’s obvious the readers are going to get the wrong idea, that’s the whole point..

Idk man looks like they did it