Kim Yeong Ran works as a bodyguard for the owner of the Gaseong Group. She comes from a poor family, and her life has been difficult due to financial struggles. She comes upon a chance of a lifetime that can change her life completely. She enters into a contract marriage with the chairman of the Gaseong Group, who has a limited time to live. She must change her own identity and survive for 3 months under a false identity, avoiding those who are after the chairman's huge inheritance.
