선 Seon

Speakers use this to refer to the limits of acceptable behavior in social interactions, often combining it with verbs like 넘다 to indicate crossing a boundary or 그들만의/분명하게 to mark a strict separation. It appears in contexts where individuals establish distance or boundaries in professional or personal relationships, such as separating colleagues or acquaintances from closer ties. In daily interactions, speakers refer to this boundary when someone's behavior, jokes, or inquiries go further than considered appropriate for the relationship.

Crossing this line can sound abrupt or intrusive, often signaling to the listener that an interaction has become uncomfortably familiar.

◆ Moral and Ethical Limits — Speakers use this to describe behavior that goes too far past acceptable social limits, often in jokes or interactions. It pairs with verbs like 넘다. A speaker uses it to point out when someone's joke or action has crossed from funny or permissible to inappropriate.

Can sound lighthearted when joking among friends, but can also serve as a serious warning that someone has breached social or behavioral expectations.

◆ Physical and Spatial Lines — Speakers use this to refer to physical lines, borders, or markings drawn on the ground, paper, or surfaces, as well as the cords or cables connecting devices. It frequently pairs with verbs like 긋다 to draw lines and 넘다 to cross boundaries. In everyday settings, it appears in instructions regarding safety zones, parking spots, and the physical setup of electronics.

Depending on the context, a physical line can feel like a rigid instruction or a simple spatial guide, often carrying a neutral, matter-of-fact tone when pointing out boundaries or equipment placement.