This is the 5001st most frequent Korean word.
기네스북에
"기네스북에" means "in the Guinness Book" (as in the Guinness World Records).
In this sentence, '기네스북에' specifies 'into the Guinness Book', where '에' refers to the location or destination where names are added.
기네스북에 이름을 올린 사람들을 살펴볼 수 있습니다.
You can look at the people who have gotten their names into the Guinness Book.
Here, '기네스북에' means 'to the Guinness Book', indicating the target (Guinness Book) for the action of attempting a record.
수영 기록으로 기네스북에 도전했습니다.
He attempted the Guinness Book with swimming records.
The use of '기네스북에' here refers to records that are 'in the Guinness Book,' showing presence or listing in the book.