This is the 8033rd most frequent Korean word.
b씨에게
"To Mr./Ms. B" or "towards B."
The phrase 'B씨에게' is used to indicate the recipient of the action, specifically the person to whom the book was given.
나는 B씨에게 책을 선물했어요.
I gave a book as a gift to Mr./Ms. B.
Here, 'B씨에게' specifies the target of the apology and uses '에게' to direct the action towards the person.
B씨에게 사과를 드리고 싶어요.
I want to apologize to Mr./Ms. B.
In this case, 'B씨에게' designates the person receiving the explanation, forming a connection between the subject and the indirect object of the verb 'to explain'.