Responses
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Oh hmm try to check page 47 on CH 67, you can see dohyun looking at his phone and it's DECEMBER 31st. And that's where the story ends for the both of them. The remaining where only side stories. The 2nd side story, which is CH 70, the author noted on the VERY FIRST PAGE that this scenes took place in between CH 66 and CH 67. So, on CH 70, look at page 22 where dohyun hanged up on his boss and the date is DECEMBER 25th. It's confusing, yes, but re-reading it again will help you somehow :)
To clear this up, the last panels of the latest chapter seems like a wishful thinking on dohyun's part. It was them being a normal couple if the incident didn't happened. But that doesn't mean that everything from CH 67 are his imaginations. No, you can check the dates on their phone, and it clearly says at the first panel of CH 70 that this chapter is in between 66 and 67. Meaning the scenes on CH 70 occur after CH 66.