ohn Liu (Takeshi Kaneshiro) is an aspiring violinist and Eve Choi (Gigi Leung) is a professional translator whose true passion is translating love poems. They live parallel lives and appear to be perfect for each other, but somehow fate seems to keep them apart. Living in different units of the same apartment building and separated by one thin wall, they never meet, because when they leave, one turns left, and one turns right.

Overview from themoviedb.org