The second season of HBO's Looking premieres on Sunday, and co-stars Frankie J. Alvarez and Raul Castillo say the show's a love letter to San Francisco.

Looking revolves around three gay men living in America's most gay-friendly city.

Patrick (played by Jonathan Groff) has come to the city to find love. His friends are also looking for something. Dom (Murray Bartlett) is having a mid-life crisis, while Agustin (Alvarez) struggles with his relationship.

The show's first season left off with two possible romantic interests for Patrick: Richie (Castillo) and Kevin (Russell Tovey).

When NewNowNext Minute asked, What role does San Francisco play in the show? Alvarez and Castillo agreed that the city helps set the show's tone.

Looking is very specific to San Francisco,” Alvarez answered. “And in a lot of ways – we've said this before – but the show is a love letter to San Francisco. And Michael [Lannan] and Andrew [Haigh], our showrunners, were really conscious about showing parts of the city that haven't been shown previously.”

Looking returns following the premiere of comedy Girls, which heads into its fourth season, and new series Togetherness, about “two couples living under one roof on the fringes of Los Angeles” on Sunday, January 11 on HBO.