Below the immortal, I am invincible, but above the immortal, I can exchange with them equally. "I am invincible below the immortals, but I am invincible above the immortals" is a famous saying of Xu Yanbing in the TV series "Swordsman in the Snow". This sentence is a summary of Xu Yanbing's strength. "Fighting Swordsman in the Snow" is adapted from the novel of the same name by the writer Fenghuo Xi Zhuhou. It tells the story of Xu Fengnian, a son of an aristocratic family who went through many hardships and eventually grew up to be the King of Bei Ming.