Prohibido suicidarse en primavera, Alejandro Casona’s play which had already been praised in Mexico in 1937, was successfully performed in Madrid in 1965. Los árboles mueren de pie was also successful in Argentina in 1949 and in Madrid in 1963. Although 60 to 70 years have passed since their debuts, both of his plays were performed in South Korea to critical praise even though the language and culture are different. Both of his plays attract the public regardless of the time period or society. It may not be evident that the positive feedback from the public represents the excellence of the work. This study introduces Alejandro Casona, who was loved by the public in 20th century Spain, and his literary universe. It examines the popularity of his works by narrative analysis, as well as of the characters. As the role of public has become wide and important in accepting works of art, this study aims to raise awareness of public popularity.