In my opinion it was well written, his level of fatigue was begging him for a quick fix, the best fix but subconsciously he has been wanting to end it all. He knows he has been barely living just going through the motions and it's such a painful way to live you can life has way of slowing down to the point where you can feel each breath you take on and exhale and ask yourself what the point is when the purpose of breathing is to extend the pain you suffer through on a daily
That's what I think too. He was half asleep or sleep walking while mumbling that he needs to go to the hospital to see grandma before he regrets not being with her on her last days. His mind couldn't handle the loads of emotions and stressed anymore ╥﹏╥
Or .....it was either Dan's another dream or jk's nightmare..but 10 days after Heesung and Potato left is not impossible for jk to find Dan with all those people who shared their photos in socmed with a famous actor like Heesung who happens to be friend of jk.
As soon as that picture was mentioned, I knew that it was going to bite everyone's ass.
Besides that, I find JKs reappearance happened way too fast. I would've liked it more, if Dan had some time underwater before getting out and having some kind of realization or wake-up call. That being said, I don't even fully understand why this was a scene in the first place. I don't believe he would kill himself before his grandma ultimately passes (her death would probably be a triggering point), even though I get that his life is just really hard. So... weird choice