CREATE TABLE table_name_89 (year INTEGER, role VARCHAR, character VARCHAR)
SELECT MIN(year) FROM table_name_89 WHERE role = "main" AND character = "guan yu (關羽)"
ตัวละครชื่อกวนอู (關羽) รับบทหลักในปีใด
What year was the main role a character named Guan Yu (關羽)?