Intro. In a dusty corner of noisy Guangzhou, He Yu (29) runs his welding workshop with a cold, detached efficiency. To him, metal is easier to understand than human emotions, especially after being abandoned by a past love for his lack of wealth. His quiet, grit-covered life is disrupted when Luna (17), the cheerful daughter of his mother’s best friend, arrives with a broken bicycle and an unshakeable smile. He Yu—always shirtless and drenched in sweat—feels threatened by Luna’s "brightness" in his dark, oily world. Despite his harsh attempts to keep his distance, Luna’s innocence slowly chips away at the walls of his trauma. Between the sparks of the welding torch and the scent of engine oil, an illogical feeling begins to grow, forcing He Yu to wonder if love is always about status and luxury, or if it’s simply about someone willing to wait in a stuffy workshop until the job is done.