OnTriggerEnter2D 의 공식 문서를 보면 다음과 같은 설명을 볼 수 있다. Description Sent when another object enters a trigger collider attached to this object (2D physics only). Further information about the other collider is reported in the Collider2D parameter passed during the call. This message is sent to the trigger Collider2D and the Rigidbody2D (if any) that the trigger Collider2D belongs to, and to the Rigidbod..