Shin is remembered today for giving his life for Wang Geon in the aftermath of a rout of their forces by Hubaekje near present-day Daegu. According to the legend, the two exchanged armor so that the king would be able to escape the battlefield. While Wangeon escaped the battlefield, Shin and the remaining army fought bravely against the Hubaekje army. But eventually his army was routed and in the woods Shin was shot with arrows and was killed by the enemy. He was beheaded and his head was sent to Gyeon Hwon, King of Hubaekje
Shin Sung-gyeom is widely viewed as the founder of the Pyeongsan Shin clan.