This origin story is unique because the characters involved belong to three native Brunei ethnic groups: the Kedayan, Tutong, and Dusun.

The combination of these three groups is also symbolic of the Tugu Tiga Gong, a monument built by the villagers in 1992 to celebrate the silver jubilee of Sultan Hassanal Bolkiah's reign.

[4] The story of Bukit Munin dates back to a time when there was a neglected area of swampy land with a small stream and a hill.

The village head decided to organise a communal work event to clear the land and transform it into a fruit orchard.

While others cut grass, trees, and gathered twigs, Liau Gundah worked at his own pace, occasionally resting.

In 1910, Chinese immigrants from China moved to Kampong Lamunin to seek a livelihood by opening retail shops for the convenience of the villagers.

In the 1950s, the Kedayan settlers initially tried farming in Kampong Tunggulian, Sungai Liang, but found the soil insufficiently fertile for rice cultivation.

[10] In the past, the appointment of a village head for Kampong Bukit Sulang was determined by mutual agreement and consensus among the residents.

[11] The "Makan Taun" and village-wide "Doa Arwah" ceremonies are long-standing cultural traditions of the Kedayan community, held annually to express gratitude after the rice harvesting season.

In the past, before the Makan Taun event, villagers would work together to build shelters and prepare the necessary items for the communal feast.

Common dishes at the Makan Taun include "Kelupis Sulang," a type of yellow rice (coloured using Sulang fruit) wrapped in Nyirik (Phrynium) leaves, as well as a variety of traditional foods like turmeric-seasoned meat and creamy Umbut Luba (Eugeissona utilis) shoots.

In addition to rice farming, the villagers also cultivate jelutong rubber and grow fruit trees such as durian, rambutan, langsat, kembayau, rambai, and tampoi.

The villagers practised a barter system for trade, exchanging their produce for British goods imported from Singapore, with transactions typically centred in Tutong town.

The facilities provided by the government greatly improved the standard of living for the villagers, leading to a better quality of life for the community.

[14] Kampong Lamunin has greatly benefited from the infrastructure provided by the government, including schools, mosques, a health centre, fire services, and a police station, all designed to support the convenience of the villagers.

In addition, basic facilities such as water, electricity, and telephone services have made it easier for the villagers to manage their daily affairs more efficiently, thus improving their standard of living.

It was constructed using round wooden posts, bamboo walls, and a thatched roof made of rumbia leaves.

Due to the mosque's deteriorating condition and the growing number of worshippers, it was repaired and renovated at a cost of $1,000, funded by public donations.

On 30 November 1979, the mosque was officially opened by Pengiran Muhammad Ali, in conjunction with the early arrival of the 15th century Hijrah.

Due to the growing congregation, a larger mosque was approved under Brunei's 5th National Development Plan, with construction beginning on 25 September 1988 on a four-acre plot costing $500,000.

It opened on 22 February 1990, coinciding with Brunei's 6th National Day, and was officially inaugurated by Deputy Minister of Religious Affairs Yahya Ibrahim on 27 July 1990.

The mosque, accommodating 230 worshippers, includes facilities such as a minaret, parking, ablution areas, and a library used for study and funeral services.

The establishment of Gong Tiga reflects the three ethnic groups—the Dusun, Kedayan, and Tutong—that settled in Kampong Lamunin before the Japanese occupation of Brunei.

The Gong Tiga monument, located in front of the Kampong Lamunin Community Hall, was inaugurated by Sultan Hassanal Bolkiah during his visit to open the Binutan water dam in Tutong on 23 November 1992.