Please, help me with a drama's name

Hi, I had a drama on my watchlist but I deleted it by mistake and I don't remember the name or the country. the drama was about travel time, the man was from the 90s and the woman lived in the present, they could travel through a bed. That is all I can remember.  Thank you.

 Six:

Is it maybe How Long Will I Love U?

WOW! So fast!. I wasted two or three hours searching and I found nothing, Thank you.  :)