both of them are quite similar....here also the sister uses the other sister's name to fool around with guys.....the only difference is that the woman was not a half-sister...she was her twin sister..in SUD SAI PAN gandaomanee meets the ML makes him fall in love with her and then leaves him as soon as she comes to know that he is the son of a small sweetseller...she uses the name gandaowasee..which is the name of her twin sister..she wants revenge because she thinks that her dad didnt wan't her and left her and only choose to bring back her twin!!..whereas the ML..heartbroken searches everywhere for her untill he meets Gandaowasee and thinks that she is the girl..but gandawasee doesnt know him and has no clue why he is pretending that she knows him.....and he thinks that just because he is the son of a sweet seller she is pretending to not know him..and wants to take revenge for what she did to him...later they end up in an arranged marriage...his mom is a sweetseller whereas his dad was the only son of a royal family..now he returns as the heir to the rich family...and hearing this gandaomanee feels bad on missing out on a good catch and comes to get back with him!!