Question: In between Kai Hansen and Serri who is a South Korean singer, songwriter and actress?

full_context: Document 1: Serri (singer): Park Mi-yeon (born September 16, 1990), better known by the stage name Serri, is a South Korean singer, songwriter and actress. She is best known as a member and leader of the South Korean girl group Dal Shabet.
Document 2: Gamma Ray (band): Gamma Ray is a power metal band from Hamburg, northern Germany, founded and fronted by Kai Hansen after his departure from the German power metal band Helloween. Hansen is the current lead vocalist, guitarist as well as the chief songwriter of Gamma Ray. The band is known as one of the most prominent bands of the German heavy metal scene.
Document 3: Michael Amott: Michael Amott (born 28 July 1969) is a Swedish guitarist, songwriter, founding member of the bands Arch Enemy, Spiritual Beggars, and Carnage, as well as a former member of the grindcore band Carcass. He is the older brother of Christopher Amott. Some major influences in his music have been Tony Iommi, Michael Schenker, Uli Jon Roth and Dave Mustaine.
Document 4: Park Subin: Park Su-bin (born February 12, 1994), better known by the mononym Subin, is a South Korean singer, songwriter and television host. She is best known as a member of South Korean girl group Dal Shabet.
Document 5: Park Gyu-ri: Park Gyu-ri (born May 21, 1988), better known by the mononym Gyuri, is a South Korean singer, actress, and radio personality. She was a member of South Korean girl group Kara.
Document 6: Han Seung-yeon: Han Seung-yeon (born July 24, 1988), better known mononymously as Seungyeon, is a South Korean singer and actress. She is best known as former main vocalist of the South Korean girl group Kara.
Document 7: Park Si-yeon: Park Si-yeon (born Park Mi-seon on March 29, 1979) is a South Korean actress. She joined the Miss Korea pageant in 2000, and using that as a springboard to an acting career, she made her acting debut in China in 2004, appearing in minor roles in several CCTV dramas. In 2005 Park was cast in her first starring role in the Korean drama "My Girl", though at the time she was more known for dating actor-singer Eric Mun. As she built her filmography in the following years, Park overcame early criticism of her acting skills and eventually gained respect as an actress in TV series such as "La Dolce Vita", "Coffee House" and "The Innocent Man", as well as the films "The Fox Family", "A Love", and "The Scent".
Document 8: Helloween: Helloween is a German power metal band founded in 1984 in Hamburg, Northern Germany by members of bands Iron Fist and Gentry. Its first line-up consisted of singer and guitarist Kai Hansen, bass guitarist Markus Grosskopf, guitarist Michael Weikath, and drummer Ingo Schwichtenberg. After the release of a self-titled EP and their debut album "Walls of Jericho" in 1985, it expanded into a quintet with the addition of singer Michael Kiske, Hansen choosing to focus on guitar instead. Under this line-up, they released the "Keeper of the Seven Keys" albums (1987 and 1988), which established Helloween as a notable heavy metal band and led to the creation of the power metal subgenre. However, Hansen left the band quickly after the release of "Part II" and was replaced by Roland Grapow. He then created the band Gamma Ray.
Document 9: Bae Woo-hee: Bae Woo-hee (born November 21, 1991), better known mononym Woohee, is a South Korean singer, songwriter and actress. She is best known as a member of the South Korean girl group Dal Shabet.
Document 10: Seohyun: Seo Ju-hyun (born June 28, 1991), known professionally as Seohyun, is a South Korean singer and actress. She debuted as a member of girl group Girls' Generation (and later its subgroup TTS) in August 2007, who went on to be one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide. Apart from her group's activities, she has established herself as an actress, notably through her participation in the original and Korean versions of stage musicals including "Moon Embracing the Sun", "Gone with the Wind" and "Mamma Mia". She also starred in the drama "". She debuted as a solo artist with her debut mini album, "Don't Say No", on January 17, 2017, making her the third Girls' Generation member to debut as a solo artist.
Document 11: Hansi Kürsch: Hans Jürgen Kürsch, better known as Hansi Kürsch (born 10 August 1966 in Lank-Latum/Meerbusch, Germany), is a German musician best known for being the co-founder, lead vocalist, co-composer, and lyricist of power metal band Blind Guardian. He was also the bassist in Blind Guardian until the 1998 album "Nightfall in Middle-Earth". He also provides lead vocals for the band Demons and Wizards.
Document 12: Kai Hansen: Kai Michael Hansen (born 17 January 1963) is a heavy metal guitarist and vocalist.
Document 13: Klaus Meine: Klaus Meine (born 25 May 1948) is a German vocalist, best known as the lead singer of the hard rock band Scorpions. He and guitarist Rudolf Schenker are the only two members of the group to appear on every Scorpions album. Meine was placed at #22 on Hit Parader's Top Heavy Metal Vocalists of All Time list in 2006.
Document 14: Michael Kiske: Michael Kiske (born January 24, 1968) is a German singer best known as the lead vocalist for the German power metal band Helloween. After his departure from the band, Kiske recorded four solo albums, participated on various metal and rock related projects, such as Avantasia, Place Vendome and Kiske/Somerville, while he also performed with numerous bands as a guest vocalist. In late 2009, he formed the hard rock / heavy metal band Unisonic and began touring again after 17 years of absence. On November 14, 2016 it was officially announced that Kiske will tour again with Helloween and Kai Hansen in 2017 and 2018.
Document 15: Mi Mi Mi: "Mi Mi Mi" is a song by Russian girl group Serebro from their upcoming third studio album. It was released on 14 June 2013 in Russia as a digital download, while an accompanying music video premiered a few days earlier on 10 June 2013. Although not a commercial success worldwide, only peaking at number 11 in Italy, the song slowly gained popularity for its catchiness and summer atmosphere. The song is played in many clubs worldwide, as well as in movies and television shows, especially in South Korea.
ground_truth: Park Mi-yeon