Kang Yong-Ju is a political offender imprisoned at Andong Penitentiary. On her 70th birthday, Chung’s mother wishes to spend one day with a surrogate son (Yoon Dong-Hwan) as a normal mother and son， only to encounter the truth and years of sadness. As this film presents itself as a gateway to our hidden histories, it reveals the ‘coat’ that is covering our soul.