The special ability of the Heart of Terra, the [Black Crown], which is the [Civilization's Continuation], allows Lin Guang to perceive emotions with extraordinary sensitivity even without activating it.
Upon closer thought, this perception of emotions has been present since the Heart of Terra was Blue, before it evolved.
In Kaelis's heart, there is never any malice towards herself, only an indescribable, intense, and complex emotion.
Expectation, cherishing, relief, joy, the desire to protect, fear of gain and loss, and even deeper layers...
Because of this, he has always believed that Kaelis would never harm him, and thus he trusts her so much.
Reflecting on it, this understanding from his own perspective is naturally correct and without any error.
But...
