Weekend Marriage (1999)

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Yoko always seems to say and do the right thing and has forever been the center of attention. Her younger sister, Tsukiko, having been compared to her sister since birth cannot help but feel inferior. Yoko has benefited from this situation for so long that she expects it to last forever. However, when Tsukiko's career takes a turn for the better and she gets engaged, Yoko feels that she must somehow sabotage her sister's success since her own career and marriage are not faring well. Tsukiko decides to defend herself, and the resultant feud threatens to ensnare their family and loved ones.