Undercurrents are surging in Nangang City, and the seven masters and their respective heroes compete for the Holy Grail under the rules of confidentiality. KK, who was born as a commoner, and Bai Mo, who is "just above all else," formed an alliance because of a mutual rescue; famous families and mercenaries, church agents and down-and-out heretics competed in the city, and alliances and betrayals occurred one after another. With the rampage caused by Caster, the whole city fell into crisis. Supervisors Nanjun and Maomao were forced to issue a crusade order, and the war order was on the verge of collapse. What's even more frightening is that Smile secretly manipulated and snatched the contract, causing the black mud of the Holy Grail to wake up in the night. Under the storm and fire, KK and Bai Mo must protect the innocent and face the choice of "ideal and price": when victory or defeat loses meaning, can they still choose each other and light? This is a group portrait legend about faith, growth and redemption.