Hong Kong Customs and Excise Department officers Chow Ching-lai and Cheung Wan-nam share a close mentor-student relationship. On a case involving seized smuggled arms, Ching-lai is sent to take part in a joint operation with Interpol to capture a reclusive arms dealer. However, Wan-nam makes a drastic decision that further complicates the case.

Based on true event, the story starts with Ka Chun (Chiu Sin Hang), an ordinary white-collar, storms the city by leaking over 3,000 photos of part-time-girlfriends (PTGF). After a series of unfortunate love, Ka Chun decides to seek relationships with PTGF and soon becomes a master on YouTube admired by thousands of netizens, namely “Score of 100”. A life turning point emerges when Ka Chun finds out that the girl Tsz Shun (Larine Tang) he has a crush on is also a PTGF. How would they overcome the hardship and survive in the cruel world of internet?