It was founded as Samdo Trading Corporation and was involved in textile, garment and zipper manufacturing in 1960s-1990s.

Samdo comprised various affiliated businesses including electronics, chemicals, automobile parts and construction.

In 1973, Samdo established an additional zipper factory in Eonyang, South Gyeongsang Province, in partnership with German and American zipper brands to support domestic apparel companies that were experiencing difficulties in delivery of manufactured clothing goods.

In November 1979, it achieved $100 million in exports with a single clothing product for the first time in South Korea.

In 1990, Samdo Group established P.T Samdonesia in Indonesia in 1989 and Cosmo Macky Industries in Sri Lanka.

It was built on a 1,200-pyeong site across from the Security Headquarters in Sunhwa-dong (currently the National Police Agency), with a total floor area of 13,000 pyeong.

In 2000, to normalize management, as a merger and acquisition, the Group was taken over by SB Finance Korea (Softbank) in December of that year.

[8] At the time, South Korea had few resources and little technology; therefore, earning dollars through exports was regarded as highly patriotic.

The letter (on the left), written by President Park Chung Hee to Samdo Trading Corporation in July 1979 (3 months before he was assassinated), indicates recognition of Samdo's contribution to the national economy and monetary prize to be used for staff welfare and development.

Further, in the 1970s and 1980s, Samdo received the Best Quality Vendor Award from Sears, Roebuck & Company, the largest department store in the U.S. at the time.