When faced with a low-price assault launched by the opportunistic businessman Zhao Chengfeng using industrially blended vinegar, chemical analyst Yan Xia returns to her family workshop, which is on the brink of collapse, determined to defend traditional aged vinegar through modern testing methods. However, her rival relentlessly pressures them in a bid to seize the supply contract for a prestigious restaurant, while her second uncle, who staunchly upholds the family traditions, initially rejects the cold, impersonal instruments. Facing challenges from both within and outside the family, can Yan Xia use precision spectroscopy to decipher the flavor secrets of traditional fermentation, expose the lies behind blended vinegar in a blind taste test one week later, and restore the fortunes of the time-honored brand? This is the biggest suspense surrounding their fight to break the deadlock.