Absolute Sword Sense
[From the author of Nano Machine:]
With a ki rampage shattering his dantian, So WoonHwi was cast aside by his family.
He was then kidnapped by the Blood Cult, where he spent his life as a third-rate spy.
One day, he is killed after being used to find the legendary Secret Records of the Sword Sage.
But instead of really dying, he wakes up 10 years in the past on the day he was kidnapped by the Blood Cult, along with the power to hear the voices of swords.