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_23399481_2 ( directed_by VARCHAR, us_viewers__in_millions_ VARCHAR )

### Question ###
If the amount of U.S. viewers is 2.14 million, who was the episode directed by?

### Accurate SQL ###

SELECT directed_by FROM table_23399481_2 WHERE us_viewers__in_millions_ = "2.14"