The fourth episode of Family By Choice, titled "An Unwelcome Visitor," continues the emotional journey of Kim San-ha, Yoon Ju-won, and Kang Hae-jun, three friends who have formed a family bond stronger than blood. This episode delves deeper into the characters' personal struggles and the impact of parental figures re-entering their lives.

The episode opens with San-ha grappling with the aftermath of his mother's call, which has left him haunted by nightmares. His emotional state is a stark contrast to Ju-won's excitement as she discovers the identity of her secret admirer. The contrast between San-ha's internal turmoil and Ju-won's external joy sets the tone for an episode filled with emotional highs and lows.
Ju-won's excitement is short-lived as her date with the secret admirer turns sour. His insensitive comments about her cheerful nature despite coming from a dysfunctional family strike a chord with Ju-won, reminding her of the judgments she faces daily. Her subsequent return home is met with surprise and concern from her family, who quickly dismiss her experience as a result of her youth. Hae-jun's disappointment in her for not appreciating the admirer's looks further highlights the lack of understanding and empathy from those around her.
San-ha's encounter with his mother, Kwon Jeong-hui, outside the school is a pivotal moment in the episode. Jeong-hui's insistence on reconnecting and her desire for San-ha to meet his new sister is met with resistance from San-ha, who is clearly hurt by her past neglect. Their conversation in the cafe is tense, with San-ha making it clear that he has no interest in being part of a family with his mother and step-sister. His father's confrontation with Jeong-hui further emphasizes the pain and resentment that San-ha feels towards his mother.
The episode also explores the dynamics between the two fathers, Jeong-jae and Dae-uk, who are both trying to navigate their roles in the lives of their children. Jeong-jae's concern for San-ha's well-being and his attempt to provide comfort by making jujube water for him is a touching moment that highlights the depth of his care for San-ha.
The conflict between Hae-jun and San-ha over San-ha's refusal to reconcile with his mother comes to a head when Hae-jun punches San-ha in public. This act of violence is a clear indication of the tension and frustration that has been building between them. San-ha's insistence on the truth of his abandonment by his mother and Hae-jun's desire for reconciliation create a rift in their relationship.
Ju-won's maturity is evident as she navigates her own emotions and those of her friends. Her decision to be open and honest with San-ha and Hae-jun about her feelings is a significant step in her growth as a character. Her ability to contain her emotions and provide support to the boys is a testament to her strength and resilience.
In conclusion, "An Unwelcome Visitor" is an emotionally charged episode that explores the complexities of family dynamics and the impact of parental figures on the lives of the three main characters. The episode is a powerful reminder of the importance of understanding, empathy, and open communication in maintaining the bonds of family, whether by blood or by choice. The performances of the cast are nuanced and engaging, capturing the emotional depth of the storyline and drawing the audience deeper into the world of Family By Choice.