After Shih-ting secures her place on the national shooting team, her sister Shih-meng mysteriously falls to her death and is accused of being a “sugar baby.” With the police hastily closing the case, Shih-ting goes undercover as “Sweet” to infiltrate the sugar-dating world and seek the truth. Entangled in a web of money, power, and control, she uncovers connections to an illicit erotic website and the drug trade. As she develops feelings for CHEN Chi-en, her benefactor, she also faces betrayal by friends and life-threatening danger. When all clues point to the website’s administrator, A-Dong, she is shocked to discover that the true killer is the person she trusted most.