This took place in 2017
Probably wasnt reason why Jangbi quit but this incident gets brought up around here at times as rumor so this is actual source video. Jangbi hasnt been showing that great of result streaming even before this and they said they settled this amicably over dinner and drinks afterwards but this incident has been blamed as contributing factor in korea
VOD transcript that led to FlaSh's outburst
+ Show Spoiler +
Sharp: Hey Jangbi, who is progamer you respect most?
Jangbi: During practice, everyone's doable, but if I meet JaeDong or Bisu [during tournament], the game just doesn't play out... During practice it's doable but tournament I lose? Well nothing much to say here
Sharp: and with Terran, FlaSh??
Jangbi: Terran? Well Terran... FlaSh is pretty good...
Jangbi: Yea he's good, and he's able to survive to point it's ridiculous
Sharp: Ah, to point it's ridiculous?
Jangbi: Well, whenever I attack Terran, they get busted, but [FlaSh] survives to point it's ridiculous. I don't exactly know why but maybe because it's Terran race?
Sharp: (bit taken aback) Ah..haha! Nah.. it's because it's FlaSh that's good not because he's Terran
Jangbi: It's because he's good right? Not because it's Terran?
Jangbi: Yea, he can survive when it should be busted. FlaSh has that kind of ability
Sharp: It must mean he's good to that point
Jangbi: I don't exactly know why though
Sharp: Protoss nowadays have hard time in TvP. Last and FlaSh are too good.
Jangbi: They have hard time with PvT??
Sharp: honestly, only person to really beat FlaSh in a full set is Jangbi
Jangbi: Did we do a full set?
Sharp: With Jin air...
Jangbi: Oh yea that one time. I think it was set of 3. I think I won 2:1? He was ahead in first game, but I pushed him out.
Sharp: When you come back, can you beat every Terran and FlaSh?
Jangbi: Of course... I will smack them up good.