Some of their most devoted fans have been camped outside of the Warfield Theater in San Francisco since midnight.
One of the main performers, 22-year-old Kevin Woo, is from the East Bay.
This is the first time he'll be performing for his hometown audience since he joined the group. He says he's excited about this opportunity.
"When I was younger I would pass by the Warfield Theater all the time," he said. "So I would always dream about when I would come to this theater and perform, but today is the day. It's a big day."
Woo was raised in Danville and went to Monte Vista High.
This is the first U.S. tour for U-KISS.