So Yi says in South Korea and in L.A.'s Koreatown, it seems like business as usual.
For 20-year-old Pomona College student Audrey Jang, who also has family in South Korea, the relationship between the U.S. and North Korea has reminded her of a carnival game.
"You know those groundhog games, where things pop up and you, like, whack it down?" Jang says. "That's not the way to resolve such a big thing."
She says she's more worried about her family overseas today, but that they're going about their lives as normal, just as they have after similar threats in the past.
Fellow student Rachael Lee, who spent her summer in Koreatown but studies at Georgetown University, says she wishes President Trump would not provoke North Korea. Lee's grandparents live in South Korea.
"Right now, there's just been such a disregard for everyone in that region," Lee says. "Like they're not really thinking about how many lives you could lose by going to war. But he just brings it up so casually. It's not something that should be joked about at all."
On the other side of Koreatown, Kyung Hee Kim, 61, has a different take. She came to the U.S. from South Korea nearly 30 years ago and still has family in both the north and south parts of the Korean Peninsula.
Kim is glad that President Trump is standing up to the North Korean dictator.
"Nobody wants to have war. Everybody knows that. But if that's the necessary, it has to be," Kim says.
Kim thinks that right now the South Korean government has been weakened by the recent impeachment of its former president. She says the U.S. has the strength necessary to step in.
But first, Kim would like to see China step up and cut off oil and other supplies to North Korea, forcing the country to come to the table to negotiate diplomatically. She wonders if Trump standing up to North Korea will ultimately lead to the reunion of the north and south, so she can finally meet her family in North Korea for the first time.