Similarities:
>> Cheating husband
>> Female lead dies (in the past)
>> Female lead seeks revenge
>> Male lead likes female lead but wasn't able to tell
>> Both leading characters went back to the past
>> Both leading characters doesn't know that the other time travelled as well
>> Male lead doing their best for female lead's happiness
>> Male lead have a wealthy background

Similarities
>> Traveling back in time...
>> Met their parents (younger version) and helped them..
>> Both changed something in their past that will definitely improve their future