Kei's eldest sister Sandra is a hot-tempered magazine editor and her temperament has left her single all this while. One of the family rules is that none of the siblings could get married before their eldest sister. Kei seeks help from the famous Casanova, Koo Chai, to pretend to court his eldest sister and lure her into the mood of love.

A young girl named Yishu believes she has no luck at all and she blames her name for it. One day she starts receiving phone calls from people thinking that she is the popular singer Tianyou. It turns out that someone has leaked 600 phone numbers of famous people to the internet and Yishu's phone number got mixed up in the bunch. She finds it annoying at first but soon she receives a text message from Xiaowen, who is the singer in an amateur rock band. He wishes to write a song for Tianyou and wants Yishu -who he thinks is Tianyou's assistant- to deliver the song to Tianyou. Tianyou is a popular singer, but hasn't had a hit number lately. Because of this she gets pressured by her cruel agent into recording an album that she doesn't want to record, because it doesn't contain any good songs. This decision gets her into a lot of trouble...

Contract About Interchange Status is a chinese romantic Comedy starring Stanley Fung.