Tremisis Energy Acquisition Corporation II

As of March 13, 2009                                                       

Tremisis Energy Acquisition Corporation II

0000 Xxxxxxxxx, Xxxxx 000-X

Xxxxxxx, Xxxxx 00000

Xxxxxxx Lynch, Pierce, Xxxxxx & Xxxxx Incorporated

As Representative of the Underwriters

4 World Financial Center

000 Xxxxx Xxxxxx

Xxx Xxxx, Xxx Xxxx 00000

Re: Insider Letters

Gentlemen:

Based on the contemporaneous due execution and delivery of (i) the Agreement dated as of even date herewith among certain Sellers (as specified therein), SoftForum Co., Ltd. and Sang-Xxxx Xxx, and Tremisis Energy Acquisition Corporation II (“Company”) and (ii) the Insider Letters of Sang-Xxxx Xxx and SoftForum Co., Ltd., X.X. Ro, H.H. Seo, Xxxxx Xxx and Xxxx Xxx, each substantially in the form provided to each of the undersigned, each of the undersigned hereby agrees that with regard to their respective letter agreements with the Company, dated November 1, 2007, the first and last sentence of Section 2, the first sentence of Section 8 and the entire Section 12 are hereby deleted in their entirety.

If the foregoing correctly sets forth our agreement, please so confirm by signing below in the space indicated.

/s/ Xxxxxxxx X. Xxxxx		/s/ Xxxxxx X. Xxxxxx
Xxxxxxxx X. Xxxxx		Xxxxxx X. Xxxxxx

Tremisis Energy Acquisition Corporation II		Xxxxxxx Lynch, Pierce, Xxxxxx & Xxxxx Incorporated,
		As Representative of the Underwriters

By:	/s/ Xxxxxxxx X. Xxxxx		By:	/s/ Xxxx Xxx
	Name: Xxxxxxxx X. Xxxxx			Name: Xxxx Xxx
	Title: Chief Executive Officer			Title: Managing Director

/s/ Xxxx-Xxxx Xxx

Xxxx-Xxxx Xxx