Do-hoon and Soo-jin are growing tired from their loveless marriage. Soo-jin learns that she is pregnant, and decides to tell Do-hoon. But he instead, tells her the big news that he has gone through vasectomy.

Soo-jin confesses her plan to start an affair and pretends to go into a man's house while Do-hoon is watching her. Do-hoon is upset but is persistent about not wanting a baby and signing his name on the divorce paper.

Soo-jin does not change her mind and asks for a divorce. Bryan persuades her to rethink. Soo-jin has a crappy plan that will get stubborn Do-hoon to sign divorce papers.

Do-hoon is experiencing primary symptoms of Alzheimer's and forgets where to go. Hang-seo learns about Do-hoon's disease, and Do-hoon refuses to tell Soo-jin.

Soo-jin continues to pretend as Yoo-jin and agrees to spend the night with Do-hoon. Meanwhile, Do-hoon's symptoms get worse as he struggles to find his way back home.

Several years pass after their divorce. Soo-jin raises her daughter by herself while Do-hoon lives with a caretaker. One day, Do-hoon leaves the nursing home to congratulate his daughter's preschool entrance.