Information for Miss Saigon at Theatre Royal, Plymouth (Musical). Set in 1975 during the final days of the American occupation of Saigon, Miss Saigon is an epic love story about the relationship between an American GI and a young Vietnamese woman. Kim is working in a sleazy Saigon night club owned by a notorious wheeler-dealer known as 'The Engineer'. John, an American GI, buys his friend Chris the services of Kim for the night. That night will change their lives forever.