(SPOILER ALERT BCS I FORGOT TO PUT THE SPOILERS THING)
I can confirm with 99% certainity after checking the raws that Hajun and his twin brother did not plan that whole car assault thing together. Just like other people have said, his twin brother got jealous and tricked Danwoo into sleeping with him and from what I can tell, this is the ONLY time that Danwoo had done anything physical with the twin brother besides some dates. The brothers hadn't intentionally been switching or sharing Danwoo back and forth. Luckily Danwoo catches on and interrogates the twin brother and he admitted to his crime. After that Danwoo goes to Hajun's place and told him everything and it seems like even Hajun had no idea about his brother's doing and immediately comforted him. I personally think that this is not suspicious, but instead him being understanding and reassuring that Danwoo was not at fault for being tricked by his brother.
There could be more twists in the future for all we know and this might bite me in the ass later, but I'm just hoping that there won't be and I think there's still hope that this will have a happy ending (• ▽ •;)
(SPOILER ALERT BCS I FORGOT TO PUT THE SPOILERS THING)
I can confirm with 99% certainity after checking the raws that Hajun and his twin brother did not plan that whole car assault thing together. Just like other people have said, his twin brother got jealous and tricked Danwoo into sleeping with him and from what I can tell, this is the ONLY time that Danwoo had done anything physical with the twin brother besides some dates. The brothers hadn't intentionally been switching or sharing Danwoo back and forth. Luckily Danwoo catches on and interrogates the twin brother and he admitted to his crime. After that Danwoo goes to Hajun's place and told him everything and it seems like even Hajun had no idea about his brother's doing and immediately comforted him. I personally think that this is not suspicious, but instead him being understanding and reassuring that Danwoo was not at fault for being tricked by his brother.
There could be more twists in the future for all we know and this might bite me in the ass later, but I'm just hoping that there won't be and I think there's still hope that this will have a happy ending (• ▽ •;)