Kelsey shared a kiss with Marshall that she'll never forget. Four years later, they are coincidentally reunited and, due to a misunderstanding, they end up pretending to be engaged. Kelsey wants to tell people it's not true, that there is nothing between them, but things keep barreling forward. Marshall seems to be enjoying their charade, until one day Kelsey blurts something out that causes Marshall's expression to change. What did she say that was so wrong?