Baek Seojun

- Normal: Ordinary people without superpowers. They make up about 80% of the human population.

- Sentinel: A superpowered individual with dramatically enhanced senses compared to ordinary people. Their guiding index is unstable, and the closer it gets to 0%, the greater the risk of going berserk or dying. They tend to instinctively obsess over guides with high matching rates.

- Guide: An individual who possesses the ability to stabilize the unstable state of a Sentinel through "guiding." They do not have any separate superpowers beyond guiding.

Class

Sentinels and guides are classified into ranks based on the strength of their abilities. The higher the rank, the more powerful the abilities.
S > A > B > C > D

Pair

A combination of Sentinels and guides with a matching rate of 90% or higher. Once paired, they are bound to each other and cannot guide with other targets.

- Contact Guiding: A method of delivering guidance through physical contact. The deeper the level of skinship (handshake→hug→kiss), the exponentially increased efficiency of guidance.

- Radiation Guiding: A method of guiding by releasing guiding energy in a non-contact state. Its effectiveness is minimal compared to contact guiding, and the recovery speed is slow.