text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_31 (season INTEGER, team_2 VARCHAR, team_1 VARCHAR, score VARCHAR)
  ### Question:
  What year did Bangkok University and Chunnam Dragons have a score of 0-0?
  ### Answer:
  SELECT SUM(season) FROM table_name_31 WHERE team_1 = "bangkok university" AND score = "0-0" AND team_2 = "chunnam dragons"