Life is always full of surprises, especially with 2 people from 2 different worlds. Ma Dai is a story with humor and romance about Tho Lam - those who have nothing in common but still oddly attach to each other. Nobody can think Tho - a 34-year-old repairer who is ugly and has never been in a relationship - has a beautiful girlfriend like Lam. As strange as it sounds, besides her current boyfriend, Lam is also in a weird relationship with a mysterious man. The secrets of these 2 characters are suddenly exposed in the most unexpected moments. That is the time when they realize that their hearts are changing...