Question: Who was one of the lead singers of the boy band Westlife from 1998 to 2012, Markus Feehily or  Yeo Hoon-min?

Context articles: Westlife
Markus Feehily
Lily Elise
Fire (Markus Feehily album)
Love Is a Drug (Markus Feehily song)
Fool Again
Swear It Again
Shane Filan
Beautiful World (Westlife song)
Yeo Hoon-min

Westlife were an Irish boy band, formed in Dublin in July 1998 and disbanded in June 2012.
 Originally signed by Simon Cowell and managed by Louis Walsh, the group's second and final line-up consisted of Nicky Byrne, Kian Egan, Mark Feehily, and Shane Filan.
 Brian McFadden was a member from July 1998 until his departure in March 2004.
Markus Michael Patrick Feehily (formerly known as Mark Feehily, born 28 May 1980) is an Irish singer and songwriter.
 He was one of the lead singers of the boy band Westlife from 1998 to 2012.
Lily Elise (born February 20, 1991) is a singer, songwriter from Berkeley, California.
 Elise has worked with artists such as Dillon Francis, Twin Shadow, Felix Cartal, Audra Mae, Gigi Radics, Markus Feehily and Hayden Panettiere.
 On November 4, 2014, she released the lead single "Generator," from her debut EP "Taken".
Fire is the debut solo studio album by Irish singer-songwriter and former Westlife vocalist Markus Feehily.
 The album was released on October 16, 2015, via Harmoney Entertainment, as part of the Kobalt Music Group.
 The album includes the singles "Love is a Drug" and "Butterfly".
"Love Is a Drug" is a song by Irish singer and songwriter and former member of Westlife Markus Feehily.
 The song was released in the United Kingdom as a digital download On 19 April 2015 through Harmoney Entertainment.
 It was released as the lead single from his debut studio album "Fire" (2015).
 The song was written by Markus Feehily, Steve Anderson and Tinashé Fazakerley; and produced by Mojam.
 The song has peaked at number 65 on the Irish Singles Chart and number 55 on the UK Singles Chart.
"Fool Again" is a song by Irish boy band Westlife.
 It was released on 27 March 2000 as the fifth and last single from their self-titled debut album (1999).
 It became the band's fifth consecutive UK number one single and spent 12 weeks on charts.
 It sold over 215,000 copies in UK so far.
 The song debuted and peaked at number two in the band's native Ireland, making it the first Westlife song not to reach the top of the Irish chart.
 The video for the single was filmed in Mexico City, Mexico, most notably in locations such as Zócalo and Ciudad Satélite.
"Swear It Again" is a song by Irish boy band Westlife.
 It was released on April 12, 1999 in the United Kingdom and on February 25, 2000 in the United States as the first single from their self-titled debut album Westlife (1999).
 It peaked at number one in the UK Singles Chart for two weeks in May 1999.
 It moved to 182,000 units in the first two weeks of its release and spent 13 weeks on the charts.
 This made it the first of fourteen UK number-one singles.
 To date, "Swear It Again" is Westlife's only single to have charted in the U.S., peaking at number 20 on the Billboard Hot 100 and ranking number 75 on the "Billboard" Hot 100 Year End Charts, in 2000.
 The song was performed live on "Miss Teen USA 2000".
Shane Steven Filan (born 5 July 1979) is an Irish singer and songwriter.
 He was one of the lead singers and frontman of boy band Westlife until the group disbanded in 2012.
 After the group disbanded, Filan released his debut solo album, "You and Me", in 2013.
"Beautiful World" is a song by Irish boy band Westlife.
 It was planned to be the lead single from their second compilation album, "Greatest Hits" but replaced by the song Lighthouse.
 The song was written by Ruth-Anne Cunningham, Mark Feehily and John Shanks and later released as promotional single.
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.