Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Sef Cadayona
Table title:
Films
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Role </th><th colspan=1 rowspan=1 > Producer </th></tr>
<tr> <td colspan=1 rowspan=1 > 2014 </td><td colspan=1 rowspan=1 > My Big Bossing's Adventures </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > 2013 </td><td colspan=1 rowspan=1 > Kaleidoscope World </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > My Lady Boss </td><td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=2 > GMA Films </td></tr>
<tr> <td colspan=1 rowspan=5 > 2012 </td><td colspan=1 rowspan=1 > Boy Pick-Up: The Movie </td><td colspan=1 rowspan=1 > Fish Vendor </td></tr>
<tr> <td colspan=1 rowspan=1 > Gayak </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Professional Productions </td></tr>
<tr> <td colspan=1 rowspan=1 > Slumber Party </td><td colspan=1 rowspan=1 > Jonel </td><td colspan=1 rowspan=1 > Cinema One Originals (presents) Origin8 Media Hubo Productions Christian Diamzon Pictures </td></tr>
<tr> <td colspan=1 rowspan=1 > Just One Summer </td><td colspan=1 rowspan=1 > Jason </td><td colspan=1 rowspan=2 > GMA Films </td></tr>
<tr> <td colspan=1 rowspan=1 > My Kontrabida Girl </td><td colspan=1 rowspan=1 > Dex </td></tr>
<tr> <td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > You To Me Are Everything </td><td colspan=1 rowspan=1 > Sef </td><td colspan=1 rowspan=1 > Regal Films & GMA Films </td></tr>
</table>
Question:
What did Sef do with the producer GMA films in 2013?
Answer:
In 2013, Sef starred in the film My Lady Boss under GMA Films.