The cousin was like a sister to her. So that's why they refer her cousin as her sister. The plot were she takes revenge for her cousin/sister, is a small similiarty.
Jao Sao Prissana. Chatchai's family got issue with Ann, making her sister died and her niece mental. So she takes revenge on pra'ek and his family, in order to torture them.
Kol Rak Game Paybath. Na'ek wants revenge, on na'rai because she stole her cousing/sister boyfriend. So in order for na'rai to feel heartbroken like her cousin/sister, make na'rai fall in love and break her heart by stealing her man.
Na'ek and Pra'ek marry before half way of the novel (in love). As to Ann and Chatchai they married almost at the begining of the lakorn (not in love).
From the passage Youa wrote. Before the wedding na'ek had already told na'rai about her revenge (not wanting to continue). I supposed if she already admit to na'rai, she didn't marry pra'ek for revenge. I do wonder why she agree to marry him, did she feel that if she marries him it make up for her using him?
[post="68738"][/post]