Question: Let's Eat 2, is a South Korean television series starring which South Korean actress and singer?

Context paragraphs:
Shim Eun-ha: Shim Eun-ha is a retired South Korean actress.  Shim rose to popularity in the 1990s, starring in some of the highest-rated Korean dramas of all time, such as "The Last Match", "M" and "Trap of Youth".  But she is best known for her acclaimed performance in Hur Jin-ho's melodrama "Christmas in August", for which she swept the Best Actress awards in 1998.  This was followed by another well-received turn in romantic comedy "Art Museum by the Zoo".  Shim suddenly retired from show business at the height of her fame in 2001, and her mystique solidified her status as the most beloved South Korean actress of that decade.

Our Gap-soon: Our Gap-soon () is a 2016–2017 South Korean television series starring Kim So-eun and Song Jae-rim.  This is the first time that a virtual couple from MBC's "We Got Married" co-stars as main cast in a serial drama on a national Korean television network.  It aired on SBS every Saturdays to Sundays at 20:45 (KST) from August 27 to October 30, 2016, and then 2 episodes every Saturdays from November 5, 2016 to April 8, 2017.  This change generated a rating increase that led to an 11-episode extension, making the series end with 61 episodes.

Yoo Da-in: Yoo Da-in (born Ma Young-seon on February 9, 1984) is a South Korean actress.  She is best known for her nuanced performance in the critically acclaimed indie film "Re-encounter", her first leading role.  In 2016, she played a supporting role in South Korean television series "Doctor Crush".

Sunmin: 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.

Seo Hyun-jin: Seo Hyun-jin (Hangul: 서현진 ; born February 27, 1985) is a South Korean actress and singer.  Seo debuted as the main vocalist of South Korean girl group, M.I.L.K in 2001 and continued until 2003 when the group disbanded.  She contributed songs as a solo artist after the group disbandment before she transitioned into acting in 2006.

Hey Ghost, Let's Fight: Hey Ghost, Let's Fight () is a South Korean television series starring Ok Taec-yeon, Kim So-hyun and Kwon Yul.  It is adapted from webtoon of the same name which was serialized on Naver from 2007 to 2010.  The series aired on cable network tvN on Mondays and Tuesdays at 23:00 (KST) for 16 episodes from July 11 to August 30, 2016.

Let's Eat 2: Let's Eat 2 () is a South Korean television series starring Yoon Doo-joon, Seo Hyun-jin and Kwon Yul.  It aired on tvN from April 6, 2015 to June 2, 2015 on Mondays and Tuesdays at 23:00 for 18 episodes.  This is the second season of 2013 "Let's Eat" series, with Yoon Doo-joon reprising his role as Goo Dae-young, who moves to Sejong City and befriends new neighbors and friends played by Seo Hyun-jin and Kwon Yul.

Kwon Yul (actor): Kwon Se-in (born June 29, 1982), better known as Kwon Yul actor.  He made his acting debut with a leading role in the 2007 high school sitcom "Mackerel Run".  Kwon is best known for his roles as Seo Ji-seok on the daily soap opera "Angel's Revenge" (2014), in the blockbuster period film "" (2014), and more recently as Lee Sang-woo in the hit romantic comedy series "Let's Eat 2" (2015).  In 2017, Kwon starred in legal thriller drama "Whisper" alongside actress Lee Bo Young and Lee Sang-yoon.

Let's Eat (TV series): Let's Eat () is a South Korean television series starring Lee Soo-kyung, Yoon Doo-joon, Shim Hyung-tak and Yoon So-hee.  It aired on tvN from November 28, 2013 to March 13, 2014 on Thursdays at 23:00 for 16 episodes.  The series is about four single people living in one apartment complex who are brought together by their love of food.

Jeong Ga-eun: Jeong Ga-eun (Korean: 정가은, born June 20, 1978) is a South Korean actress and entrepreneur, who has appeared in several Korean television series such as "Rollercoaster" and "Sunday Sunday Night".

Supporting paragraphs: Let's Eat 2 Seo Hyun-jin
Answer: Seo Hyun-jin