Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT SUM(season) FROM table_name_31 WHERE team_1 = "bangkok university" AND score = "0-0" AND team_2 = "chunnam dragons"