Sisters Lan and Tao are as different as night and day: Lan is hard-working and sincere, whereas Tao is easily tempted by life’s pleasures. Yet they have one thing in common: they are both in love with the same man. He marries the sensual Tao, who recklessly squanders his money and eventually leaves him for another man. Can Lan still save her sister from moral ruin? NATIONAL CUSTOMS was intended to promote the New Life Movement, advocating a virtuous lifestyle. The 1935 drama marks the final film appearance of the iconic actress Ruan Lingyu, who tragically took her own life shortly before the premiere.