To, Indirect object marker
This expression is used to indicate the person to whom a question, request, suggestion or order is verbally directed. It is mainly used in colloquial speech when emoting the speech of others.
1. This expression can be replaced with 더러 with no major change in meaning.
In addition, when 더러 is used after the pronoun 나 or 너, they are often combined with ㄹ더러 instead of simply 더러.
2. The particles 보고 and 더러 can be replaced with both 한테 and 에게.
However, when the sentence is not expressing quoted speech, then 한테 and 에게 cannot be replaced with 보고 or 더러.
Using 보고 here is incorrect because the sentence is not expressing quoted speech.
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