Both are about an object that allows one or both of the leads to travel back a few hours in time to undo their deaths as they try to figure out who is killing them.
Both the leads are connected in some magical way and keep dying over and over and moving slightly back in time, trying to figure out how to survive the events that caused their death the first time.
Both are mini dramas in which the leads are caught in a time loop that always ends with them dying, and must figure out who's behind it to survive and get out of the loop.