Question: What profession Yeo Hoon-min and Bill Champlin have in common?

Context paragraphs:
Chasin' the Wind: "Chasin' the Wind" is a rock ballad song written by Diane Warren and recorded by the band Chicago for their 1991 studio album "Twenty 1", featuring Bill Champlin on vocals.  The song was produced and engineered by Ron Nevison and was mixed by Humberto Gatica.  "Chasin' the Wind" was released as the first single from "Twenty 1" in January 1991.  Its B-side is the song "Only Time Can Heal the Wounded".

Yeo Hoon-min: Yeo Hoon-min (Korean: 여훈민 ; born August 16, 1991), also known by his stage name Hoon, is a South Korean singer and actor.  He is best known as a member of South Korean boy band U-KISS under NH Media.  He joined the group in February 2011 after the departure of Alexander Lee Eusebio and Kim Kibum.  Hoon currently attends Dongguk University, majoring in theatre and film.

Airplay (band): Airplay was a short-lived American band, formed by David Foster and Jay Graydon.  The band released a self-titled album in 1980, containing "Nothin' You Can Do About It" (originally recorded by The Manhattan Transfer) and a cover of the Earth, Wind & Fire hit "After the Love Has Gone", written by Foster and Graydon with Bill Champlin.

Turn Your Love Around: "Turn Your Love Around" is a vocal pop/R&B single by George Benson.  The song was written by Grammy winners Bill Champlin of Chicago, Steve Lukather of Toto and producer and guitarist Jay Graydon to help fill out Benson's 1981 greatest hits album, "The George Benson Collection".

Bill Champlin: William Bradford "Bill" Champlin (born May 21, 1947 in Oakland, California) is an American singer, guitarist, keyboard player, arranger, producer, and songwriter.  His performance work is principally associated with the bands Chicago and the Sons of Champlin.  He has won multiple Grammy Awards for songwriting.

Tamara Champlin: Tamara Champlin is an American singer-songwriter who started her career as a session singer in Houston, Texas, later moving to Los Angeles.  She has performed with and written for singers such as Elton John, Leon Russell, Nicky Hopkins, Andreas Carlsson, husband Bill Champlin and son Will Champlin.  Tour Dates from 2010-2016 with Bill Champlin included California, Europe, Hawaii, Japan, South America, Kuwait and Iraq ; she is a full member of the Sons of Champlin, active in the Rhythmic Arts Project to benefit children, and the Saving K-9 Lives Charity encouraging adoption of shelter pets.

The Rhythm Dukes: The Rhythm Dukes was a short-lived band featuring Jerry Miller and Don Stevenson of Moby Grape, subsequently joined by Bill Champlin, of the Sons of Champlin, and later of Chicago.

Here in My Heart (Chicago song): ""Here in My Heart" is a 1997 song written by Glen Ballard and James Newton Howard and performed by Chicago.  Keyboardist Bill Champlin sings lead, with bassist Jason Scheff singing the bridge.  It was one of two new songs from the band's "The Heart of Chicago 1967-1997" CD.  "Here in My Heart" was the group's eighth and final number one on the Billboard Adult Contemporary chart, and the track also reached #59 on the Hot 100 Airplay chart.

Runaway (Bill Champlin album): Runaway is an album by Bill Champlin, released on Elektra Records in 1981.  It is notable as containing "Tonight Tonight", Champlin's major hit as a solo artist, as well as "Sara", which also achieved a degree of chart success.

Sons of Champlin: The Sons of Champlin is an American rock band, formed in the late 1960s and from Marin County in the San Francisco-Bay area.  They are fronted by vocalist/keyboardist/guitarist Bill Champlin, who was also a member of the rock band Chicago.  They brought to the late 60's music scene in the Bay Area a soulful sound built around a horn section, sophisticated arrangements, philosophical themes, Bill Champlin's songwriting and blue-eyed soul singing, and Terry Haggerty's jazz-based guitar.  They are one of the 1960s San Francisco bands, along with Jefferson Airplane, The Grateful Dead and  Moby Grape.

Supporting paragraphs: Bill Champlin Yeo Hoon-min
Answer: singer