Brolin is the 9th Prince of the Black Dragon Mountain Empire, and the grandson of the World Master Hargrave. Due to his status, he was accompanied by a team of Stellar Level 9 bodyguards during his Universe Trainee Mercenary Exam. When the World Within a World was revealed, he wanted to get all of the treasures left by Kabu for himself, and with Hargrave's assistance, out of the 500,000 sent by the empire, 220,000 followed his orders.

Trivia:

- In the novel, Brolin's name is 布罗林 (Bù luō lín), while in the donghua the name is 布洛琳(Bù luò lín)

- In the novel, Brolin is explicitly a male, while in the donghua Brolin is explicitly a female.