Question: Ock Joo-hyun participated in what musical based on a book by T.S. Eliot?
Context: Cats is a musical composed by Andrew Lloyd Webber, based on "Old Possum's Book of Practical Cats" by T. S. Eliot, and produced by Cameron Mackintosh.  The musical tells the story of a tribe of cats called the Jellicles and the night they make what is known as "the Jellicle choice" and decide which cat will ascend to the Heaviside Layer and come back to a new life.  "Cats" introduced the song standard "Memory".  The first performance of "Cats" was in 1981. Lee Jin (born March 21, 1980) is a South Korean actress.  She made her entertainment debut as a member of the K-pop girl group Fin.K.L, along with Lee Hyori, Ock Joo-hyun, and Sung Yu-ri.  After Fin.K.L disbanded, Lee became an actress. Sweeney Agonistes by T.S. Eliot was his first attempt at writing a verse drama although he was unable to complete the piece.  In 1926 and 1927 he separately published two scenes from this attempt and then collected them in 1932 in a small book under the title "Sweeney Agonistes: Fragments of an Aristophanic Melodrama".  The scenes are frequently performed together as a one-act play.  "Sweeney Agonistes" is currently available in print in Eliot's "Collected Poems: 1909–1962" listed under his "Unfinished Poems" with the "Fragments of an Aristophanic Melodrama" part of the play's original title removed.  The scenes are separately titled "Fragment of a Prologue" and "Fragment of an Agon." Charlotte Champe Stearns Eliot (1843–1929), was a school teacher, poet, and social worker.  She was the daughter-in-law of William Greenleaf Eliot, a leading minister in St. Louis, Missouri and a founder of Washington University in St. Louis, Missouri, mother of T.S. Eliot, a famous poet, editor and literary critic, and spouse of Henry Ware Eliot, who ran the Hydraulic Press Brick Company in St. Louis, Missouri. The Poetry Book Society (PBS) was founded in 1953 by T. S. Eliot and friends, including Sir Basil Blackwell, "to propagate the art of poetry".  Eric Walter White was secretary from December 1953 until 1971, and was subsequently the society's chairman.  The PBS was chaired by Philip Larkin in the 1980s.  Each quarter the Society selects one newly published collection of poetry as its "Choice" title for its members and makes four "Recommendations" for optional purchase.  The Society also publishes the quarterly poetry journal, the "PBS Bulletin", and until 2016 administered the annual T. S. Eliot Prize for Poetry.  Following the Poetry Society's instigation of its New Generation Poets promotion in 1994, the Poetry Book Society organised two subsequent "Next Generation Poets" promotions in 2004 and 2014.  In 2016 the former Poetry Book Society charity which had managed the book club from 1953 had to be wound up, with its director Chris Holifield appointed as the new director of the T.S. Eliot Prize, and with its book club and company name taken over by book sales agency Inpress Ltd in Newcastle. The Musical () is a 2011 South Korean television series starring Ku Hye-sun, Choi Daniel, Park Ki-woong, Ock Joo-hyun and Kim Eun-se.  It aired on SBS from September 2 to December 23, 2011 on Fridays at 22:00 for 15 episodes. Hamlet and His Problems is an essay written by T.S. Eliot in 1919 that offers a critical reading of "Hamlet".  The essay first appeared in Eliot's "The Sacred Wood: Essays on Poetry and Criticism" in 1920.  It was later reprinted by Faber & Faber in 1932 in "Selected Essays, 1917-1932".  Eliot's critique gained attention partly due to his claim that "Hamlet" is "most certainly an artistic failure".  Eliot also popularised the concept of the objective correlative—a mechanism used to evoke emotion in an audience—in the essay.  The essay is also an example of Eliot's use of what became known as new criticism. Charles William Eliot (March 20, 1834 – August 22, 1926) was an American academic who was selected as Harvard's president in 1869.  He transformed the provincial college into the preeminent American research university.  Eliot served until 1909, having the longest term as president in the university's history.  He was a cousin of the Nobel Prize-winning poet T.S. Eliot. Grizabella is the "Glamour Cat" in the musical production "Cats".  She does not appear in T. S. Eliot's work "Old Possum's Book of Practical Cats", but she is a prominent character in the stageplay.  It appears that she is the feline version of the woman mentioned in T.S. Eliot's poem "Rhapsody on a Windy Night". Ock Joo-hyun (; sometimes spelled Ock Ju-hyun; born March 20, 1980) is a South Korean singer and musical theatre actress, known mostly for her role as the lead singer of the South Korean girl group Fin.K.L.  After their unofficial breakup in 2002, Ock released three solo albums and has participated in musicals, namely "Aida", "Chicago", "Cats", "42nd Street", and "The Count of Monte Cristo".
Answer: Cats