Prom struggled to find his form after recovering from injuries but claimed a tied sixth placing at the Taiwan Golf and Country Club last year, his first top-10 in 21 attempts.
Since then, the burly Thai has not looked back, claiming four top-10s without missing a single cut this year to make him one of the top draws in the US$600,000 Asian Tour event.
He will be joined by title holder and compatriot Pariya Junhasavasdikul and local favourites Lin Wen-tang, a five-time Asian Tour winner and an in-form Lu Wei-chih, winner of the Yeangder Tournament Players' Championship on home soil in early October.
Chinese Taipei's veteran Hsieh Min-nan is also in the line-up and will be in the running of re-writing history after becoming the oldest player at the age of 70 years and 53 days to make the halfway cut in last year's event.
Prom will continue to hold on to his mantra of keeping things simple as he hopes to overcome to tricky Taiwan Golf and Country Club.
"I used to think about what was wrong with my shot whenever I hit a bad shot. But now, I've learnt to cut the bad things out from my head. Now, I just stick to a good routine and concentrate and focus on my game," said Prom, whose lone victory on the Asian Tour was in 2006.
"I only had negative thoughts before. When I got to the tee box, I would think if I would go left or right. Now, I've been able to overcome that," added the Thai, who is currently in 24th place on the Order of Merit.
Pariya, who is a licensed pilot, admits he has taken his foot off the gas pedal since his victory last year and will need to be at his best for a successful title defence. He has only one top-10 finish so far this year.
"This year is a little bit more relaxed. I guess I need that sense of urgency that I'm not playing that well anymore. Get off my butt and do something about it," said the 27-year-old.
A strong line-up of Asian Tour champions will headline the Mercuries Taiwan Masters next week including Asian Tour rookie Joonas Granberg of Finland, Australian Rick Kulacz and Japanese star Daisuke Maruyama.
The Mercuries Taiwan Masters increased its prize money by US$100,000 this year and is the second Asian Tour tournament to be held in Chinese Taipei.