During the Woori World store competition, the Wylde Pak family faces chaos as customers fight over limited stock of Hallasand cookies from Jeju Island. Jack Wylde acts as a decoy while the rest of the family gets caught in various conflicts: Halmoni battles a rival elder, Min is overwhelmed by durian smell, Lily is cornered by a three-aunt hydra, and Will is hit by a bottle of gochujang sauce. Jack ultimately saves Lily and secures the final box of Hallasand by using himself as a decoy for the others, proving his place in the family despite challenges to his status.

Lily Pak is accustomed to stability and staying close to home, while her half-brother Jack Wylde is adventurous, having lived a more transient life with his mother. Their contrasting personalities and backgrounds create tension and humor as they adjust to living together in a blended Korean American family during their first summer vacation together.

Halmoni, the grandmother, serves as a guiding and protective figure in the family. She defends Jack's place in the family during the Woori World store competition when a rival challenges his status, emphasizing his belonging despite not being a biological member of the family. She also participates actively in family events and conflicts, such as battling a rival elder during the store chaos.

Jack and Lily help run the family's pet grooming and boarding business. This setting is a backdrop for many of their interactions and adventures as they navigate their new family dynamics and learn about each other's lives and culture.

Jack and Lily's parents, including their father Will Wylde and mother Min Pak, along with Halmoni, provide guidance and support as the half-siblings learn to coexist. They help the children navigate the challenges of blending their previously separate lives, cultural identity, and family dynamics, fostering understanding and cooperation within the household.