Lin Xuan is a young illegitimate son of the Lin family who is constantly bullied. He secretly possesses a Thunder Spirit Sacred Body. After falling off a cliff, he unexpectedly obtains the ancient supreme treasure, the Nine Tribulations Spirit Tower, and encounters the remnant soul of the Thunder Emperor, beginning his path of cultivation. He patiently endures hardship and grows stronger while carrying the blood feud of his family. To protect his loved ones, he faces every challenge head-on and assumes the alias Lei San to join the Qingyun Sect. Through countless trials and life-or-death battles, he befriends like-minded companions and fights against the evil Blood Fiend Sect. Remaining true to himself and refusing to bow to the powerful, he tempers his abilities in repeated desperate situations, uncovers ancient secrets, and resolves to uphold justice and protect those around him as he gradually embarks on his own heaven-defying path of cultivation.