Who is Park Jisung brother?

Excuse me, but could you possibly clarify who you are referring to when you mention "Park Jisung"? Is he a public figure, a celebrity, or perhaps a notable individual in the field of cryptocurrency or finance? Assuming he has a brother, could you provide any context or background information about their relationship? Is there a specific reason why you're inquiring about his brother, or is it just a general question of curiosity? Additionally, if you could provide any details about the brother's identity, occupation, or relevance to the cryptocurrency or finance world, that would be greatly appreciated.