In the romantic comedy 100 Days With Mr Arrogant, Hayeong is heartbroken after being dumped by her boyfriend on their 100th day anniversary. Out of sheer frustration, she kicks a soda can that accidentally hits the head of Hyeongjun, a wealthy and handsome man driving his luxury car. Startled by the impact, Hyeongjun loses control and scratches his expensive vehicle against a wall. Since Hayeong cannot pay for the costly damages, Hyeongjun convinces her to sign a contract binding her to his service for 100 days to pay him back. What starts as a miserable chore soon turns into a series of funny situations as the two clash at every turn. Despite their rocky beginning and the silly terms of their daily agreement, spending so much time together sparks unexpected feelings. This charming rom-com follows their journey from enemies to lovers, proving that sometimes the worst accidents can lead to the most beautiful love stories.