A young woman rides the waves of changing times in Liang Ming’s Wisdom Tooth (日光之下, Rìguāng Zhīxià). Perhaps innocence is something slightly painful you’re better off without, but awakening to life’s light and shade can be a difficult process. Gu Xi (Celeste Lv) is suffering with a dull ache in her jaw and the solution is, apparently, merely pain killers but you can only numb yourself so long before you have to make a choice of whether to go on living with the pain, or free yourself from it.
A young, if slightly immature woman, Gu Xi has a job in a local hotel and lives alone with her half-brother, Gu Liang (Wu Xiaoliang), who, until recently, has eked out a living as a fisherman. A recent oil spill revealed to have occurred some time ago but covered up by the authorities has put paid to that, while Xi also finds her job under threat because she has an undocumented status and there is shortly to be some kind of inspection. Having grown up without a mother and entirely ignorant of who her father might have been, Xi feels acutely anxious about her circumstances and is dependent on Liang for a sense of security. It is therefore unsettling for her when he develops an interest in the sophisticated Qingchang (Wang Jiajia), daughter of local mob boss Zhou (Chen Yongzhong) and a recent returnee from South Korea where she had been living with her mother.
A mirror image of Xi, Qingchang is everything she she’s not. Xi is well known for wearing her brother’s clothes, dressing like a tomboy for reasons that are a combination of poverty and affection, where Qingchang has wardrobes full of the latest fashions brought back with her from overseas including a beautifully crafted Hanbok featuring an elaborate embroidered design. As much as she’s resentful and intimidated, Xi can’t help admiring the slightly older woman, captivated by her sense of self assuredness, and eventually develops a sisterly bond with her even while fearing that she may steal her brother away.
A further intrusion, however, disrupts their tentative familial bonding. A fisherman found dead and floating on the sea hints at a burgeoning turf war between local bosses Zhou, Qingchang’s father and Liang’s employer now that he’s taken a job as a security guard at the docks, and Jiang (Tao Hai), a melancholy Christian who owns the hotel where Xi had been working. Though warned by others that Jiang seemed “creepy”, Xi feels indebted to him because her job at the hotel was saved after she approached him to intervene. Her habit of recording the conversations around her to listen to later presents her with a problem when she discovers that Zhou may have bumped off the fisherman himself and is planning to frame Jiang for the crime. Jiang, it seems is also receiving protection money to ensure the fishermen’s safety, apparently a promise he wasn’t able to keep. Xi is pulled three ways. She loses confidence in Qingchang who is now both tainted by association and a figure of mild discomfort, while fearful that if she reveals what she knows, serves justice and repays a debt by clearing Jiang, she will ruin her brother’s happiness and risk his rejection.
Trapped in he realms of childhood, what she most wants is to preserve her status quo. Liang is everything to her – brother, father, and somewhat uncomfortably a figure of romantic impossibility. Her feelings towards Qingchang are mired in complexity, a nascent attraction perhaps underlying her sense of jealousy either misdirected through her complicated feelings for her brother or simply finding its anchor for the first time. An angry speech at her brother’s birthday party during which she inappropriately reads out a semi-explicit passage from a lesbian novel hints at an attempt to resolve an attraction she feels is taboo, though it is unclear for whom it is directed. As with most young people, she must come to an accommodation with the fact that her world is changing. A childhood promise that she and her brother would never marry, preserving their family of two forevermore, was always unrealistic but she struggles to let go of the idea of permanence in a childish sense of familial security. Like the oil polluting the seas, her world is coloured by uncertainties but like anyone else she discovers that her agency is limited and whatever choice she makes others will make their choices too. That dull ache in her jaw is a reflection of the ills of the world around her, an inconvenient tooth that needs to be plucked out and discarded leaving only the cold comfort of adult wisdom behind in its place.