Love Alarm — Characters & Cast

Shifts from basic emotional and financial survival to seeking authentic emotional honesty and self-forgiveness.

Evolves from a defensive orphan avoiding intimacy via digital shields into a mature woman who confronts her childhood trauma, accepts vulnerability, and makes an active romantic choice.

Transitions from suppressing his feelings out of loyalty to Sun-oh to openly pursuing long-term commitment with Jo-jo.

Moves from an unassertive secret admirer in the background to an emotionally steadfast partner who actively courts Jo-jo through sincere, analog effort without relying on the app.

Evolves from using romantic affection to fill a deep void of familial neglect to seeking closure and authentic peace.

Starts as a confident yet emotionally neglected young man seeking warmth, but unravels into bitterness and lingering attachment after being abruptly abandoned, before finally learning acceptance and closure.

Shifts from creating an algorithm to force romantic recognition to realizing the unintended societal damage of his invention.

Starts as a bullied tech prodigy who invents the app out of unrequited affection for Gul-mi, fakes his disappearance, and returns as a wiser arbiter who helps Jo-jo find emotional agency.

Evolves from an obsession with social climbing and algorithmic popularity toward genuine self-acceptance.

Jo-jo’s self-absorbed cousin who chases the prestige of the Love Alarm Badge Club, but eventually experiences self-realization and human humility.