Hotel del Luna

Both are set in a hotel.
Both have a scene of mystery and suspense.
(SPOILER) Both have a romance that slowly blossoms over time.

recommendations are not just about similarities, so I'll just say (beside be melodramatic) TTON is the drama that got me out of my HDL slump~

Mistura de romance, fantasia e espíritos. Protagonistas ligados por uma missão do além e sentimentos eternos.