Question: Which South Korean singer born in 1986 appeares as a guest to the Seoul Concert?
Context: Girls' Generation World Tour "Girls & Peace" is the fifth concert tour by South Korean girl group Girls' Generation.  The tour was officially announced in April 2013 after the last 2 days of "2nd Japan Tour" with two dates in South Korea and plans for future dates across the globe.  Although initially announced as a "world" tour, the group only visited seven cities in six countries across East Asia and Southeast Asia.  They released a DVD of Seoul concert, 'Girls' Generation - World Tour: Girls & Peace in Seoul' on March 30, 2015. Kim Ki-bum (born September 23, 1991), better known by his stage name Key, is a South Korean singer, actor, fashion designer and television presenter.  Born and raised in Daegu, South Korea, he later travelled to Seoul after a successful audition at the S.M. National Tour Audition Casting.  In 2008, Key debuted as a member of South Korean boy group Shinee, who later went on to become one of the best-selling artists in Korea.  Key is widely recognised as a singer, but he has also ventured into different careers, notably as an actor and fashion designer. Lee Sung-min (born January 1, 1986) is a South Korean singer and actor.  He is a member of the South Korean boy band Super Junior and its sub-groups Super Junior-T, Super Junior-H and Super Junior-M. Super Junior-K.R.Y. The 1st Concert is the first concert tour and sixth international tour by South Korean boy band Super Junior sub group, Super Junior-K.R.Y..  The Asia tour commenced with two shows in Tokyo from 1 to 2 August 201o and hit a total of 12 concerts This concert gathering over 22,000 fans.  Super Junior members Donghae, Sungmin dan Heechul along with label-mate Shinee dan TRAX appeared as guests in the Seoul Concert. FC Seoul is a South Korean professional football club based in Seoul, South Korea, who currently play in the K League Classic.  FC Seoul's first participation in Asian competition was during the 1986 season, when they competed in the Asian Club Championship, their first match was against Hap Kuan of Macao, but FC Seoul withdrew.  FC Seoul's next participation in Asian competition was 1999–2000 Asian Cup Winners' Cup and actual first match was Shimizu S-Pulse of Japan. Han Sun-hwa (born October 6, 1990), is a South Korean singer and actress.  She is a former member of the South Korean girl group Secret.  She made her television debut in 2004 while participating in SBS's "Superstar Survival" as a finalist, and in 2009, she was a regular cast on a variety show called "Invincible Youth".  Aside from music, she also ventured into acting and made her debut in the 2010 drama, "More Charming By The Day".  She also acted in several dramas with supporting roles in "Ad Genius Lee Tae-baek", "God's Gift - 14 Days", and "Marriage, Not Dating".  In 2014 she finally starred as a lead actress on MBC's weekend drama "Rosy Lovers" as Baek Jang Mi co-starring with actor Lee Jang Woo.  CNN International Seoul listed Sunhwa as one of the nine rising "It" stars in Korean entertainment citing her as a "multi-tasking" artist.  Her portrayal of Kang Se-Ah in the 2014 TVN drama, "Marriage, Not Dating" earned her a nomination for "Best Youth Actress" at the 16th Seoul International Youth Film Festival.  In 2014, her portrayal of Jang-Mi from "Rosy Lovers" and Jenny from "God's Gift 14 Day"s won her two best new actress awards from MBC and SBS Drama Awards.  It was confirmed on September 26, 2016 that Sunhwa had not renewed her contract with TS Entertainment and will officially part ways in October.  On October 14, 2016 Sunhwa joined Huayi Brothers as an actress. Kidoh (키도) (born 16 December 1992 in Seoul) is a South Korean singer, rapper, composer, producer and songwriter.  He was a member of the South Korean boy band Topp Dogg, and the first Topp Dogg band member to release a solo album.  He has been active member of South Korean hiphop crews called Rockbottom and Daenamhyup for several years. Lee Seung-Cheol (; also spelled Lee Seung-Chul; born December 5, 1966 in Seoul) is a South Korean singer.  He was the main vocalist of Boohwal, a South Korean rock band, until 1989 when he left the band and released his first solo album, "Don't Say Good-Bye" (안녕이라고 말하지마).  In 2005 his 7th album, "The Livelong Day", won him Korean Music Awards for best male singer.  He has been working as a judge in reality television series "Superstar K".  On August 27, 2014, Lee performed "Arirang", "Bridge over Troubled Water" and "The Day" at the opening ceremony of the 65th Annual UN DPI/NGO Conference. Sunmin (Hangul: 선민, "Katakana": ソンミン, born August 4, 1987) is a South Korean singer who speaks and sings in Korean, Japanese, and English.  She debuted in 2006, with the single "Keep Holding You," a collaboration with the Japanese R&B singer Toshinobu Kubota.  Her career was initially focused on the Japanese market, but her work became focused in South Korea from 2009 to 2010.  She also contributed to original soundtracks of South Korean television series "Master of Study" and "Gloria (2010 TV series)".  In 2010 to 2011, she was in the main South Korean musical production of "Jekyll & Hyde" as Lucy.  In 2012 to 2013, she reprised her role as Lucy in the South Korean national tour.  In spring 2013, Sunmin played Josephine in the South Korean production of "Arsène Lupin", the musical. The Gwiyomi Song, or Kwiyomi Song (귀요미 송), is a K-pop single by South Korean singer Hari and was released on February 18, 2013.  It was inspired by a gesture from South Korean rapper Jung Ilhoon of boy group BtoB.  The gesture is called 'Gwiyomi Player', that was popularized by South Korean variety show "Weekly Idol" through a segment called "The Aegyo Battle" (Battle of Cuteness) following Ilhoon's guest appearance on the show in October 2012.  The song went on to be a viral success and an Internet meme after Korean Media outlet "Sports Seoul" uploaded a clip of Hari performing the gestures and singing the song.  This video has since inspired many Asian netizens to upload their own versions onto the internet.
Answer: Lee Sung-min