TRANSLATION) JOINT FILING AGREEMENT
EXHIBIT A
In accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended, the
undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13D
(including any and all amendments thereto) with respect to the common stock of GRAVITY Co., Ltd.,
par value W500 per share, and further agree that this Joint Filing Agreement shall be included as
an Exhibit to such joint filing.
The undersigned further agrees that each party hereto is responsible for timely filing of such
statement on Schedule 13D and any amendments thereto, and for the completeness and accuracy of the
information concerning such party contained therein, provided that no party is responsible for the
completeness and accuracy of the information concerning the other party, unless such party knows or
has reason to believe that such information is inaccurate.
This Joint Filing Agreement may be executed in one or more counterparts, each of which shall
be deemed to be an original instrument, but all of such counterparts together shall constitute but
one agreement.
In evidence thereof the undersigned, being duly authorized, hereby execute this Agreement this
1st day of November 2007.
| EZER Inc. | ||||
| By: | /s/ Yoo Il Young | |||
| Name: | Yoo Il Young | |||
| Title: | Representative Director | |||
| /s/ Yoo Il Young | ||||
| Yoo Il Young | ||||
