The Demon Zither: Heart of the Zither

This is a martial arts world where 'zither heart is sword heart'. Legend has it that the ancient artifact 'Demon Zither' is not an instrument but a manifestation of resentment from heaven and earth. Those who merge with it can attain physical sanctity and immunity to all poisons, but at the cost of 'cutting off all emotions and love'. Eighteen years ago, after a great calamity in the martial world, the zither disappeared, and peace returned, until now when turmoil stirs again.