Luang Phu Sin of Wat Laharn Yai in Rayong - Lineage Master of Luang Phu Tim (Wat Laharn Rai). One of the preservation masters of the Wicha Pra Khun Phaen Pong Prai Kumarn of Luang Phu Tim.

Luang Phu Sin of Wat Laharn Yai (Rayong), is along with Luang Por Sakorn (Wat Nong Grub, Rayong) and Luang Por Somkid of Wat Beung Tata (Rayong), one of the three major Looksit of Luang Phu Tim of Wat Laharn Rai, and one of the three direct lineage masters who inherited the Magical Wicha from Luang Phu Tim.

Luang Phu Sin, is one of three masters were given shares of the famous Pong Prai Kumarn powders, for extensive transmission of the Wicha, through both Magical training, and the use of the same original Muan Sarn Ingredients for the magical amulets and charms made in the lineage of this particular Master