"The Secret of Birth" Sung Yoo Ri leaves her baby and the father of her child right after she gives birth.

April 28, an episode of the SBS weekend drama "The Secret of Birth" featured Hong Gyung Doo (Yoo Joon Sang) going after Jung Yi Hyun (Sung Yoo Ri), who ran away after giving birth to her child.

In this episode, Hong Gyeong Doo goes to the police station to report his wife missing. However, he does not know anything about her. Therefore he is unable to report Jung Yi Hyun as missing and comes back home disappointed since there is nothing he can do.

At home, Hong Gyeong Doo discovers a note that Jung Yi Hyun had left. Jung Yi Hyun stated in the letter that her real name is Yoon Hee.

In the letter, she had written, "I won't be coming back. I'm just as dead as a person jumping off of a cliff anyway. Live your life hating an evil person like me." Hong Kyeong Doo bursts out crying after reading her letter.