Question: Steve Augeri and Hahm Eun-jung both work as what profession?

Context paragraphs:
Sisters-in-Law (TV series): Sisters-in-Law () is a 2017 South Korean television series starring Hahm Eun-jung, Lee Joo-yeon, Kang Kyung-joon, and Cha Do-jin.  The series airs daily on MBC from 20:55 to 21:30 (KST), however, starting episode 41, the series was moved to Monday and Tuesday 20:55 (KST) time-slot with 2 episodes back-to-back.

Revelation (Journey album): Revelation is the thirteenth studio album by American rock band Journey, and their first with lead singer Arnel Pineda.  It features 11 new songs ("Faith in the Heartland" was previously recorded with Steve Augeri), 11 re-recorded greatest hits (all featuring Pineda) and a DVD (North American version only) featuring the current lineup's March 8, 2008 concert in Las Vegas, Nevada.  Three singles penned by Neal Schon and Jonathan Cain were released to radio: the distinctively Journey-sounding "Never Walk Away," "Where Did I Lose Your Love," and the power ballads "After All These Years."  and "Where Did I Lose Your Love" both found success on the adult contemporary charts.  "Where Did I Lose Your Love" peaked at No. 19, while "After All These Years" peaked at No. 9 on "Billboard"'s Adult Contemporary chart and stayed on the charts for over 23 weeks.

Generations (Journey album): Generations is the twelfth studio album by the American rock band Journey.  It was the band's last album with lead singer Steve Augeri and second album with drummer Deen Castronovo, confirming the line-up of 2001's "Arrival" and 2002's "Red 13" EP.  The album was given away for free by the band during most of the concerts of the "Generations Tour" in 2005, and subsequently released on Sanctuary Records later the same year.

Arrival (Journey album): Arrival is the eleventh studio album by the American rock band Journey, released in the United States in 2001.  A version with one substituted song was released in Japan in 2000.  The album was the band's first full-length studio album with new lead vocalist Steve Augeri, who replaced popular frontman Steve Perry, and with Deen Castronovo, who replaced Steve Smith as the band's drummer.

Good Bye (EP): Goodbye is the re-issued EP by Hahm Eun-jung (also known as Elsie).  The title song is "Goodbye," which is an OST of Eun-jung's Webdrama "Only for You".

Journey 2001: Journey 2001 is the first live DVD by the American rock band Journey, released in 2001.  It is also the only live DVD to feature Steve Augeri on lead vocals, who replaced longtime singer Steve Perry in 1998 with the song "Remember Me" on the .  It features footage of a concert recorded in December 2000, in Las Vegas, Nevada.  The setlist was primarily old songs from the band's history, as well as two new songs from the then-upcoming album "Arrival", which was released later in 2001.  Kevin Shirley produced and mixed the audio tracks.

Hahm Eun-jung: Hahm Eun-jung (born December 12, 1988), better known by the mononym Eunjung, also known as Elsie, is a South Korean singer and actress.  She is best known for being a member of South Korean girl group T-ara.  In May 2015, she made her solo debut as Elsie with mini album "I'm Good".

Tall Stories (band): Tall Stories is a band made up of singer Steve Augeri, who also sang for Tyketto and Journey, guitarist Jack Morer, bass guitarist Kevin Totoian and drummer Tom DeFaria.

Steve Augeri: Steve Augeri (born January 30, 1959) is an American rock singer best known for his work with Tall Stories, Tyketto, and Journey.

Optometry: Optometry is a health care profession which involves examining the eyes and applicable visual systems for defects or abnormalities as well as the medical diagnosis and management of eye disease.  Traditionally, the field of optometry began with the primary focus of correcting refractive error through the use of spectacles.  Modern day optometry, however, has evolved through time so that the education curriculum additionally includes intensive medical training in the diagnosis and management of ocular disease in countries where the profession is established and regulated.  Optometrists (also known as Doctors of Optometry in the US and Canada for those holding the O.D. degree or Ophthalmic Opticians in the UK) are medical professionals who provide primary eyecare through comprehensive eye examinations to detect and treat various visual abnormalities and eye diseases.  Being a regulated profession, an optometrist's scope of practice may differ depending on the location.  Thus, disorders or diseases detected outside the treatment scope of optometry are referred out to relevant medical professionals for proper care, more commonly to ophthalmologists who are physicians that specialize in tertiary medical and surgical care of the eye.  Optometrists typically work closely together with other eye care professionals such as ophthalmologists and opticians to deliver quality and efficient eyecare to the general public.

Supporting paragraphs: Steve Augeri Hahm Eun-jung
Answer: singer