I am really enjoying Love, Timeless. Waiting a week for each new ep is hard. Any other dramas with lead going to the past to fix stuff or avoid the person they think they shouldn't be with. thanks

i have to start watching it but i think this fits the bill,
Operation Love (2017)
oldiest drama, but its great
step in to the past 
Proposal Daisakusen
Juunen Saki mo Kimi ni Koishite
Marry him if you dare
Proposal Daisakusen (Japanese version)

Operation Proposal (Korean remake and what I thought to be vastly superior)
+1 for Nine  that's the whole plot
Shuttle Love Millennium 
This is very good. You can watch it at boxasian

thanks for all the recs!