Raised like a true son by Uncle Jeong-jae, Hae-jun always harbored a quiet desire to repay his family's kindness. To relieve their financial burdens, he initially left for the United States with his wealthy biological father. However, he secretly returned to Korea and completed his mandatory military service without informing anyone, enduring years of lonely independence so as not to burden his loved ones. Outwardly warm, cheerful, and full of bright energy, Hae-jun uses humor to mask his deep sensitivity and past sacrifices. Because he and Hye-rin both sacrificed their youth to ease the family's burdens, he finds a unique sense of safety and genuine authenticity around her without needing to hide his true feelings.

The spirited and beloved daughter of Uncle Jeong-jae, Ju-won grew up surrounded by the intense affection of her three brothers. Left behind in the old neighborhood when the others departed, she channeled her passion into baking and successfully opened a popular local bakery. Bright, highly expressive, and fiercely genuine, she matured into an independent business owner while remaining deeply sentimental and emotionally transparent. Ten years of aching longing and unanswered questions have made her reunion with her brothers a flood of overwhelming joy, tearful anger, and unfiltered emotion. She holds a deeply special bond with San-ha, relying on him as her ultimate protector despite her sharp reproaches for his long absence.

Weighted by a childhood filled with unfair guilt from his cold mother, San-ha left for Seoul right after high school. Forced by circumstance, he spent ten grueling years studying medicine while acting as the sole caregiver for his paralyzed mother and young half-sister. Now a brilliant and widely respected surgeon, his exterior is calm, quiet, and intensely rational. Beneath his stoic demeanor lies a fierce, unwavering protectiveness over his family—especially Ju-won. During his years of emotional isolation and immense pressure in Seoul, thoughts of Ju-won served as his only emotional anchor. He expresses his deep affection not through words, but through silent, constant vigilance and acts of absolute devotion.