Hi Worasa,
Please forgive me, I do not read Thai. Could you explain to me in english please?
For the record, when I signed this "Letter of return" I had no knowledge that I had to vacate the land. There was no translator or witness present on my behalf, unlike the orginal rental agreement. I would say it was misleading and not valid.
If your company and team would like yo discuss more I am free to meet anyday. You could also call my manager K'Ball at 095-805-9963.