Task: Explanation
Input (English): Jung Eui-chul (born April 19, 1985) is a South Korean model and actor. He made his acting debut in the drama Biscuit Teacher and Star Candy as a student and gained positive response in 2005 and later landed on many supporting roles including the award-winning films such as Five Senses of Eros and popularity based novel film "Do Re Mi Fa So La Ti Do". The peak of his career was reached in 2009 as a main role in the award-winning and most popular recognized drama "Boys Over Flowers" which gained international Asia attention. Question: How many episodes does the South Korean television series at which Jung Eui-chul reached the peak of his career have?  Answer: 25 episodes
Output (English):  The peak of his career was reached in 2009 as a main role in the awardwinning and most popular recognized drama Boys Over Flowers which gained international Asia attention.