Hard candy tells the story of Jeff, a famous photographer. He is a modest gentleman on the surface, but fooling around behind his back. He not only cheats on his girlfriend, but also often chats up young girls outside or on social apps. He is good at PUA (strike up a conversation art), almost invincible, and countless girls have been deceived by him. Jeff didn't even remember the names of these girls after he achieved his goal.

PUA, the full name of which is "expert in picking up girls", originally meant "expert in chatting up people". It originally refers to the behavior that men accept systematic study and practice, and constantly update and improve their EQ. Later, it generally refers to people who attract and fascinate the opposite sex and their related behaviors. At present, with the rapid development of various forms of organizations, online courses, offline training and other ways to instigate people to cheat, every ordinary person may become a victim of PUA.