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_6 ( assists INTEGER, name VARCHAR, venue VARCHAR, competition VARCHAR )

### Question ###
What is the sum of the assists kang jae-soon had in the k-league competition in ulsan?

### Accurate SQL ###

SELECT SUM(assists) FROM table_name_6 WHERE venue = "ulsan" AND competition = "k-league" AND name = "kang jae-soon"