Battle for Happiness

Miho works in the digital division of a bank. While selecting the winners for an SNS event, she gets in touch with Eugene, a bad relationship from her past after 18 years. When Miho sees Yujin living happily on social media, she feels complex and subtle emotions.

It's the day of the English kindergarten presentation. During a Cinderella play, Jiyul told So-won who swung a magic wand at her, "Don't hit me! Wrong! " She shouts. Due to this, the event is suspended, and Yujin and Ji-ye fight over responsibility. Yujin accepts Miho's offer to shoot a commercial to put an end to child abuse rumors surrounding herself and Ji-yul.

As rumors circulate within the bank that Miho is directly involved in Yujin's death, Miho is pressured by her superiors to take holidays for the time being. Meanwhile, at Bong-seok's request, Miho goes to the aquarium with Ji-yul and Ha-yul. As time passes, Miho develops affection for his children...

Miho, who is in charge of the children, is clumsy in everything about childrearing, and even though she is invited to social gatherings with mothers, she doesn't fit in properly. She even receives unpleasant personal attacks from Na-young for no reason...

Mi-ho takes the pictures of Tae-ho's affair to the police but fails to see the detective in charge. After an argument with Mi-ho, Na-young goes to Jung-ah to kick Mi-ho out, but Jung-ah doesn't comply. When Mi-ho learns Tae-ho is having an affair with A-ra, she decides to apologize to Na-young.

Mi-ho finds Na-young just in time and saves her life. When words get out about Na-young's suicide attempt, Jung-ah blames it on Mi-ho and looks into her past. Meanwhile, Mi-ho gives up on finding Yu-jin's killer and returns to work. But feeling guilty, she decides to look after the kids and find the truth about Yu-jin's death.