I don't know on which website you are watching "time", but i believe that kseries.net is the one that provides English Subs the fastest (of course i could be mistaken here) and if you are as impatiently waiting for the subs as i do, this will probably save you some time.
(I only say this, because from what i know kseries.net isn't that known, so you might not have tried it out yet)
P.S: I am really happy that Seohyun has got the lead role in this drama, because everything about it (production, scenery, plot) is really amazing!