best plot and awesome cast and all the characters have done their part if u like revenge dramas ,must watch part 1 and following part 2 . there will be no lag ,the ride while be exciting from the beginning , and talking about the main leads i think the director does not intent to add more chemistry between leads as it is a revenge drama, and if you are a fan of korean drama like me ,you will be pleased with the ending outcome .its a simple oneway revenge story which revolves a lot of characters if your fan of revenge dramas ,Give it a go.