Character Arc
So Eun-ho is the male lead of Branding in Seongsu, an energetic and idealistic intern at the same branding agency and a former college rival of Kang Na-eon. Where Na-eon is polished and pragmatic, Eun-ho is earnest and principled, convinced that the marketing industry can be more honest and that good work should not require cutting corners. His optimism repeatedly collides with the agency's hard-nosed culture.
When his soul ends up inside Na-eon's body, Eun-ho is suddenly handed the authority and scrutiny of the agency's star team leader. He must hold up a reputation built on flawless competence while privately scrambling to keep the swap hidden, a situation that plays for comedy as his open, impulsive personality strains against Na-eon's controlled image.
Over the course of the series Eun-ho's idealism is tested and tempered by the realities he experiences from inside Na-eon's life, while his sincerity becomes the emotional anchor of their partnership. As the two work to reverse the swap and confront problems inside the company, their rivalry turns into understanding and then romance. [FLAG: arc beats summarized from public sources; verify finale specifics.]