6 months later after Ahn Hana's disappearance:
Eun Min Ah watches Do Sejin leaves his house. She runs to catch him. He moves sideways before she can grab his hand. She falls on the concrete, knees scraped. "Do Sejin, don't be this way."
He looks down at her coldly. "I don't have time for this."
She clutches her bulging belly under her thick coat. "I am pregnant with your child. How could you do this to me? What if I lose the baby?
Both of them graduated from the university. Do Sejin has already cleared the Bar exam, but Eun Min Ah failed.
"I don't believe that it is mine." He tells her sternly, "I have been careful with you."
"I told you that I made holes in those ċȯndȯms when we did it last time." She stands up and yells, "It's yours."
"You have refused paternity testing. I am refusing this child." He doesn't want to be bothered by her anymore. He walks ahead of her. "Besides that, even if you were pregnant with my child, I would never marry you. We can both raise the child without getting married."
Eun Min Ah is filled with rage. "Why do you refuse me? You never fulfilled the agreement. You gave me one month to make you fall for me. But, you left me after your sister died."
Do Sejin stops a few steps away from her. He turns around and glances at her threateningly. His old demeanor is gone. He steps back to her and stops only a few centimeters away from her. She shrinks down when she notices the darkness in his eyes.
"Eun Min Ah, do you really think that a stupid agreement is more important than my sister's death?" He steps closer. His knuckles turning white when his grip on the suitcase handle become hard. "I appreciate that you took care of my mother during those times, but I don't love you. I won't lead you on. Rather than being stuck in a marriage without love, I want to be single for the rest of my life."
He will live for Hana only. For that tomorrow when she reappears in the world. There is no place for any other woman.
She starts crying. "What about our child? Do you want our baby to live without a father? What about your parents who want to see their only grandchild?"
"I am a lawyer. If I want, I can take custody of the child easily." He gives her a dangerous look. "You won't win in a fight with me. But, I won't do that. Since you have helped my family once during the hardest moment of our lives, I will accept this child as my child with or without the paternity test. You can stay at my house and raise it with my parents. We won't marry. Still, you can pretend that you are my wife and lie to my parents and the world that we have already married. I will prepare the fake certificates. The house, my family, and the child will be yours. But, you won't bother me anymore. Do you accept?"
Eun Min Ah purses her lips and furrows her brows. She is pregnant. It's not Do Sejin's child. They both know it. But, Do Sejin's parents don't know that. Her family also believes that it is Do Sejin's child.
Back then, Do Sejin didn't come back to her after his sister died. She didn't understand what was going on. Ahn Hana and the 100th-day killer were related to Seol A's murder. After the disappearance of Ahn Hana, the killer also disappeared.
Those were delicate days. She stayed with his mother to take care of her. Since he didn't come back to her after that day, she wanted to be sure that she would become pregnant with his child. It was the only way to trap him. She made a choice and slept with some other men she met at the pub. The pregnancy test came positive. She did a paternity test secretly and found out that the child is not Do Sejin's.
She doesn't know who the real father is. She doesn't care. She has decided that the father is Do Sejin. Since she loves him a lot, only he can become her child's father.
He left the house four months ago. Currently, he is staying at some other place. She doesn't know where.
Do Sejin is obsessed to find his sister's killer. His heart is already into that. He doesn't look at any woman. Until the killer is found, he is unlikely to stop. If someday, a woman appears in his life, she will take care of that woman.
"I accept." She tells him with a smile on her lips, "If it is a fake marriage certificate, then I will accept that for the sake of our baby."
Do Sejin leaves without a word. She returns to his parents' house after her half victory. A lie becomes truth if told loud enough. A few days later, a copy of the fake marriage certificate is delivered to her. She signs it and sends its picture to all the relatives and friends.
To the world, Do Sejin and Eun Min Ah are married and waiting for their first child.