Unless you are starring in a movie, drama is the last thing you would want on your big day. Luckily for Singaporean actor Desmond Tan (陈泂江), his character in his first leading movie role is dogged by madcap drama. The 31-year-old beefcake plays the harried groom in the latest Singapore feature film, The Big Day, and Taiwanese actress Amber An (安心亚) is his long-suffering bride .  Helmed…