Adapted from
墨香铜臭's novel
魔道祖师, it follows the outcast
魏无羡 and the upright
蓝忘机.
陈情 'to plead one's case' is the name of Wei Wuxian's flute, and
令 is a word for a short tune, so the title means 'the tune of Chenqing'. The novel's romance became a sworn friendship on screen.