A mother who divorced her husband due to his violence and is separated from her son. Tired of everyday life, the mother comes to the hot springs for a trip. The man is her long-lost son. At first, the mother doesn't recognize her son... but halfway through, the son confesses his true identity.<br /> A son who resents his mother for abandoning him, "I can't see you as a mother now. Because you abandoned me, my life has been a mess. Even at this age, I still don't know anything about women... If you're going to pretend to be my mother, then teach me about women," the son threatens. The mother offers her body, saying, "I'm sorry I'm such a bad mother." The son feels pleasure from sex after a long time, and then he pressures his mother into a relationship, and a rotten mother-son relationship begins.